Evaluation of sources drinking water in environmental polluted region from chemical and microbiological point of view / Naďa Sasáková, Ingrid Papajová, Oľga Ondrašovičová, Katarína Laktičová, Gabriela Gregová, Hanna Bis-Wencel, Ján Venglovský, Jana Mareková, Rudolf Hromada, Miloš Halán KE304