TY - CPAPER AU - Elena Kozlova TI - NATURAL METHODS OF WASTEWATER TREATMENT T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference PY - 2012 DO - 10.5593/sgem2012/s13.v3035 PB - Stef92 Technology ER -