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.24) for all X , Y , Z , W ∈ χ ( M 2 n +1 ), where A and B are non - vanishing 1- forms defined in (1.1) and G is the tensor of type (1, 3) defined in (1.2) . The concircular curvature tensor C [ 25 ] of type (1, 3) is given by C ¯ ( X , Y ) Z = R ¯ ( X , Y ) Z − r ¯ 2 n ( 2 n + 1 ) G ( X , Y ) Z , $$\begin{array}{} \displaystyle \overline{C}(X, Y)Z=\overline{R}(X, Y)Z-\frac{\overline{r}}{2n(2n+1)}G(X, Y)Z, \end{array}$$ (3.25) where r is the scalar curvature of the manifold under D -homothetic deformation. Let us consider an extended generalized


The paper is focused on developing a predictive, statistical model depicting the relationships among companies' involvement in internationalization, engagement in cooperation with business partners and their fnancial performance.

Data were collected through a CATI survey of managers of medium-sized Polish manufacturing enterprises. The principal statistical technique employed was binary logistic regression. The regression equation model contained four statistically significant dichotomous predictors: (1) sales abroad above 30% of total sales, (2) cooperation with foreign suppliers, (3) cooperation with domestic distributors, and (4) Export-Only Early-Internationalized status of the company. The two former variables were correlated positively with the profit margin, while the two latter shown negative associations.

The principal limitation of the study was a relatively small sample size of 110 units that, while enough to detect patterns with strong and medium-strong effect sizes, might not have provided sufficient power to identify weaker associations. Generalizations were also constrained by the selection criteria of the sample to medium-sized Polish enterprises from traditional manufacturing B2B industries.

The study yielded a regression model that permitted isolation of the main factors linked to the degree of sales profitability, which could assist managers in their efforts to enhance profit margins and in competitor analysis. The originality of the approach involves using a comprehensive list of 25 potential predictors in analysis that represented salient dimensions of cooperation and internationalization. The predictive capacities of the model were found to be sufficient to make it useful for both scholars and practitioners. The research relied on a sample drawn from the population that has rarely been studied on similar subjects.


Background: A lower tax morality leads to an increased readiness to become active in the unofficial economy and causes the lack of public revenues.

Objectives: The aim of this paper is to investigate determinants that shape tax morale of Croatian citizens.

Methods/Approach: An ordered logit model is employed to evaluate which determinants shape tax morale of Croatian citizens. Data for the research were collected from 2,000 face-to-face interviews conducted in Croatia in late 2015.

Results: The descriptive analysis illustrates that 52 percent of respondents reported a high level of tax morale, 26 percent of respondents have a low tax morale, while 8 and 14 percent have a mid-low and a mid-high tax morale, respectively. The ordered logit analysis revealed that gender, age, financial situation, region, and participation in the unofficial economy have an impact on the tax morale.

Conclusions: Besides socio-demographic, socio-economic, and spatial determinants, a great number of sanctions for participation in informal activities also shapes tax morale of the Croatian citizens. More precisely, marginal effects show that those perceiving the expected sanctions as “normal tax or social security contributions due, plus a fine or a prison sentence” have by 6.3 percentage points higher probability of reporting the highest tax morale than others.


The discrete-time Holling type II prey-predator models with the refuge and Allee effects are formulated and studied. The existence of fixed points and their stabilities are investigated for both hyperbolic and non-hyperbolic cases. Numerical simulations are conducted to demonstrate the theoretical results.


In this paper we initiate the study of Armendariz graph of a commutative ring R and investigate the basic properties of this graph such as diameter, girth, domination number, etc. The Armendariz graph of a ring R, denoted by A(R), is an undirected graph with nonzero zero-divisors of R[x] (i.e., Z(R[x])*) as the vertex set, and two distinct vertices f(x)=i=0naixi and g(x)=j=0mbjxj are adjacent if and only if aibj = 0, for all i, j. It is shown that A(R), a subgraph of Γ(R[x]), the zero divisor graph of the polynomial ring R[x], have many graph properties in common with Γ(R[x]).


This paper aims at assessing the usefulness of leading indicators in business cycle research and forecast. Initially we test the predictive power of the economic sentiment indicator (ESI) within a static probit model as a leading indicator, commonly perceived to be able to provide a reliable summary of the current economic conditions. We further proceed analyzing how well an extended set of indicators performs in forecasting turning points of the Macedonian business cycle by employing the Qual VAR approach of . In continuation, we evaluate the quality of the selected indicators in pseudo-out-of-sample context. The results show that the use of survey-based indicators as a complement to macroeconomic data work satisfactory well in capturing the business cycle developments in Macedonia.


We study submanifolds of a quaternionic projective space, it is of great interest how to pull down some formulae deduced for submanifolds of a sphere to those for submanifolds of a quaternionic projective space.


The purpose of this paper is to determine potential indicators of systemic banking crises in five Southeast European countries. Although signal horizon in the literature usually implies a period of 12 months before and 12 months after a crisis outbreak, models in this paper imply a 24-month pre-crisis period. Probability of a banking crisis occurrence is calculated using logit regression. Results have shown that banking system indicators have higher impact on probability of systemic banking crisis occurrence compared to macroeconomic indicators, and that the banking systems of these countries are significantly exposed to global trends.


We study lightlike hypersurfaces M of an indefinite Kaehler manifold of quasi-constant curvature subject to the condition that the characteristic vector field ζ of is tangent to M. First, we provide a new result for such a lightlike hypersurface. Next, we investigate such a lightlike hypersurface M of such that

(1) the screen distribution S(TM) is totally umbilical or

(2) M is screen conformal.


Intangible assets and knowledge are key drivers of today’s economy, called knowledge economy, as a consequence of globalisation process and information and communication technology development. Knowledge and intellectual capital became leading factors that provide basis for gaining superior performance and sustainable competitive advantage of firms in dynamic and uncertain business environments. Invisible goods based on knowledge are becoming more important in generating and successful managing businesses. The purpose of this research is to test the impact of human resources on creation of the firm or, in other words, to examine individual’s inclination toward becoming an entrepreneur in transition economy such as Bosnia and Herzegovina. While investigating the relationship between human resources and firm creation, additional social, economic and emotional factors are included in analysis. Proposed theoretical model is tested using logistic regression model to analyse a sample of 2.015 individuals in Bosnia and Herzegovina, as a participant in GEM project in 2014. Obtained results show that the amount of individual’s knowledge, skills and expertise and its capability to seek and recognize new entrepreneurial opportunities, considered as human resources owned by individual, increase probability to generate a firm in Bosnia and Herzegovina. Beside human resources, certain economic and social factors, such as work status and social perception of entrepreneurship as an attractive profession, are important for firm creation in Bosnia and Herzegovina.