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References 1. Płuciennik-Koropczuk E., Sadecka Z., Myszograj S.: COD fractions in raw and mechanically treated wastewater. Civil and Environmental Engineering Reports, No. 11, (2013), 101-113. 2. Sadecka Z., Jędrczak A., Płuciennik-Koropczuk E., Myszograj S., Suchowska-Kisielewicz M.: COD fractions in sewage flowing into Polish sewage treatment plants. Chemical and Biochemical Engineering Quarterly, Vol. 27, no. 2, (2013), 185-195. 3. Ekama G.A., Dold P.,L., Marais G.v.R.: Procedures for determining influent COD fractions and the maximum specific growth rate of

References ABDEL-AAL, E.S.M., HUCL, P., SOSULSKI, F. W., GRAF, R., GILLOTT, R. PIETRZAK, L.: Screening spring wheat for midge resistance in relation to ferulic acid content. J. Agric. Food Chem., 49, 2001, 3559-3566. ADOM, K. K., LIU, R. H.: Antioxidant activity of grains. J. Agric. Food Chem., 50 2002, 6182-6187. ADOM, K.K., SORRELLS, M.E., RUI, H.L.: Phytochemicals and antioxidant activity of milled fractions different wheat varieties. J. Agric. Food Chem., 53, 2005, 2297-2306. ALVARE-JUBETE, L., WIJNGAARD, H., ARENDT, E.K., GALLAGHER, E.: Polyphenol

from different genetic horizons of brown soil developed from heavy loam. Rocz. Glebozn. – Soil Sci. Ann. 35(1): 115–124. Caravaca F., Lax A., Albaladejo J., 1999. Organic matter, nutrient contents and cation exchange capacity in fine fractions from semiarid calcareous soils. Geoderma 93(3–4): 161–176. Chojnicki J., 2002. Soil-forming processes in alluvial soils of central Vistula valley and Żuławy. Wyd. SGGW, Warszawa: 83 pp. Czaban J., Czyż E., Siebielec G., Niedźwiecki J., 2014. Longlasting effects of bentonite on properties of a sandy soil deprived of the humus

:] A. Górniak (ed.) Ekosystem zbiornika Siemianówka w latach 1990-2004 i jego rekultywacja (The ecosystem of Siemianówka reservoir in years 1994-2004 and its restoration), Wyd. UwB, Białystok: 107-118 (in Polish). Kentzer A., 2001, Fosfor i jego biologicznie dostępne frakcje w osadach jezior o różnej trofii (Phosphorus and its biologically accessible fractions in bottom sediments of lakes of diverse trophic state), Wyd. UMK, Toruń, p.111 (in Polish). Kowalczewska-Madura K., Jeszke B., Furmanek S., Gołdyn R., 2005, Spatial and seasonal variation of phosphorus

References [1] Adams, W.W. and Davison, J.L., A remarkable class of continued fractions, Proc. Amer. Math. Soc. 65 (1977) 194-198. [2] Boyarsky, A. and Góra, P., Laws of Chaos: Invariant Measures and Dynamical Systems in One Dimension, Birkhäuser, Boston, 1997. [3] Brezinski, C., History of Continued Fractions and Padé Approximants. Springer Series in Computational Mathematics 12, Springer-Verlag, Berlin, 1991. [4] Corless, R.M., Continued fractions and chaos, Amer. Math. Monthly 99(3) (1992), 203-215. [5] Davison, J.L., A series and its associated continued

and Management of Lakes and Reservoirs, Third Edition, CRC Press, Boca Raton, pp. 591. Dorich R.A., Nelson D.W., Sommers L.E., 1984, Availability of phosphorus to algae from eroded soil fractions, Agr. Ecosyst. Environ. 11(3): 253-264. Fabre A., Qotbi A., Dauta A., Baldy V., 1996, Relation between algal available phosphate in the sediments of the River Garonne and chemically-determined phosphate fractions, Hydrobiologia 335(1): 43-48. Golterman H.L., 2001, Fractionation and bioavailability of phosphates in lacustrine sediments: a review, Limnetica 20

Naturalnych 40: 660–668. SZUMSKA (WILK) M., GWOREK B. 2009. Metody oznaczania frakcji metali ciężkich w osadach ściekowych. Ochrona Środowiska i Zasobów Naturalnych 41: 42–63. TESSIER A., CAMPBELL P.G.C., BISSON M. 1979. Sequential extraction procedure for the speciation of particulate trace metals. Analytical Chemistry 51, 7: 344–351. ZHOU D.M., HAO X.Z., TU C., CHEN H.M., SI Y.B. 1998. Speciation and fractionation of heavy metals in soil experimentally contaminated with Pb, Cd, Cu and Zn together and effects on soil negative surface charge. Geoderma 83, 1–2: 55–66.

References [1] BOSMA,W.-JAGER, H.-WIEDIJK, F.: Some metrical observations on the approximation by continued fractions, Indag. Math. Series A 86, 1983, 281-299. [2] ERDŐS, P.: Some results on Diophantine approximation, Acta Arith. 5 (1959), 359-369. [3] ITO, SH.-NAKADA, H.: On natural extensions of transformations related to Diophantine approximations, In: Proceedings of the Conference on Number Theory and Combinatorics, Japan 1984 (Tokyo, Okayama and Kyoto, 1984), World Sci. Publ. Co., Singapore, 1985. pp. 185-207. [4] JAGER, H.: Some metrical observations on the

References Anderson D.L., Beverly R.B., 1985. The effects of drying upon extractable phosphorus, potassium and bulk density of orga- nic and mineral soils of the everglades. Soil Science Society of America Journal, 49: 362-366. Becher M., Kalembasa D., 2011. Fractions of nitrogen and car- bon in humus horizons of arable Luvisols and Cambisols lo- cated on Siedlce upland. Acta Agrophysica, 18(1): 7-16. (In Polish). Gilliam F.S.. Richter D.D., 1988. Correlations between extracta- ble Na, K, Mg, Ca, P & N from fresh and dried samples of tw o Aquults. Journal of Soil

References BROERSMA K., LAVKULICH L.M. 1980. Organic matter di­stribution with particle-size in surface horizons of some som- bric soils in Vancouver island. Canadian J. of Soil Sci. 60(3): S83-S86. BROGOWSKI Z., FARIDA H.R., KOCON J. 1992. Ultrastruc­ture of clay grains and humus and nitrogen content in soil fractions of north-east Sahara. Pol. J. ofSoilSci. I: 101-111. BROGOWSKI Z., OKOŁOWICZ M. 2008. Bilans węgla orga­nicznego i azotu we frakcj ach granulometrycznych gleby alu- wialnej. [Ratio of organic carbon and nitrogen in particle size fractions of