HEGROVÁ, Jitka, Przemyslaw NIEDZIELSKI, Slawomir GARBOS a Jan SWIATCZAK. Determination of Arsenic Speciation in Surface and Ground Water Sampled from Klodska Valley (Poland). Polish Journal of Environmental Studies. Olsztyn,Polsko: HARD Publishing Company, 2004, roč. 13, IV, s. 106-109. ISSN 1230-1485.