TY - CPAPER AU - George G. Gogoberidze TI - VARIABILITY OF PARTICULATE MATTER IN SAINT-PETERSBURG MEGACITY AIR WITHIN CLIMATIC TIME SCALE T2 - 14th International Multidisciplinary Scientific GeoConference SGEM 2014, Energy and Clean Technologies, Vol. 14, Book 4, Volume 2 PY - 2014 DO - 10.5593/sgem2014/b42/s19.079 PB - Stef92 Technology ER -