[Central Statistical Bureau of Latvia, 2002. // http://www.csb.gov.lv/]Search in Google Scholar
[European Environmental Agency. CSI 024 - Urban waste water treatment - Assessment published Jan 2009.]Search in Google Scholar
[Kirk B. and Al. Methods for Comparison of Wastewater Treatment Options. Prepared for the National Decentralized Water Resources Capacity Development Project. - Washington University, St. Louis, USA, 2005.]Search in Google Scholar
[Rydén L. and Al. Environmental Sciences. -The Baltic University Press; Uppsala, 2003.]Search in Google Scholar
[Cheremisinoff N. P. Handbook of water and wastewater treatment technologies. - Boston, United States of America, 2002.10.1016/B978-075067498-0/50014-0]Search in Google Scholar
[Droste R. L. Theory and practice of water and wastewater treatment. - United States of America and Canada. 1997.]Search in Google Scholar
[Inventory data acquired from the Daugavgriva WWTP in April 2009.]Search in Google Scholar
[Actions to limit emissions and discharges of nutrients from land based sources // Helsinki Commission. Land-based Pollution Group 13th Meeting. Kaliningrad, Russia19, May 2008.]Search in Google Scholar
[Halla T. Water management in Riga and in Copenhagen. The Sea and the Cities project. - University of Helsinki, Finland, 2000.]Search in Google Scholar
[Nielsen and Al. Emission Factors for gas fired CHP Units < 25 MW. - National Environmental Research Institute. Roskilde, Denmark, 2004.]Search in Google Scholar
[Cuéllar A. D. et Al. Cow power: the energy and emissions benefits of converting manure to biogas. - Department of Chemical Engineering, The University of Texas at Austin, USA, 2008.10.1088/1748-9326/3/3/034002]Search in Google Scholar
[Rochas M. Analysis of Mechanisms for CO2 Emission Reduction in Latvian Energy Installations. - RTU EEF, Riga, 2006.]Search in Google Scholar
[Weiland P. Impact of competition claims for food and energy on German biogas production. - Johann Heinrich von Thünen-Institute. Federal Research Institute for Rural Areas, Forestry and Fisheries. Braunschweig, Germany, 2008.]Search in Google Scholar
[Metcalf & Eddy Inc. Wastewater engineering: Treatment, disposal and reuse. - United States of America. 1979.]Search in Google Scholar
[Lee C. C., Lin S. D. Handbook of Environmental Engineering Calculations. 2nd edition. - United States, McGraw-Hill Companies, 2007.]Search in Google Scholar
[Rochas M. Analysis of Mechanisms for CO2 Emission Reduction in Latvian Energy Installations. - RTU-EEF, Riga, 2006.]Search in Google Scholar
[Kampschreur M. J. et Al. Nitrous oxide emission during wastewater treatment. - Dutch Foundation for Applied Sciences STW, 2009.10.1016/j.watres.2009.03.00119666183]Search in Google Scholar