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2. Pawełczyk, A. & Muraviev, D. (2003). The integrated treatment for purification of liquid pig wastes. Przem. Chem. 82 (8-9), 861-863, (in Polish).
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3. Kowalski, Z., Makara, A., Hoffmann, J. & Hoffmann, K. (2012). Research report from realization of grant No 14-0003-10/2010. Obtaining of NPK type fertilizers from the pig manure using cleaner production methods. Cracow University of Technology, Cracow, (not published), (in Polish).
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6. Kowalski, Z., Makara, A., Hoffmann, J. & Hoffmann, K. (2012). Polish patent application P. 400044, (in Polish).
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7. Polish standard PN-ISO 6060:2006. Water quality - Determination of the chemical oxygen demand, (in Polish).
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8. Polish standard PN-EN 25663. Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium, (in Polish).