1. Bikbulatov, E.S. and Skopintsev, B.A., Assessment of Techniques for the Determination of Organic Carbon Content of Natural Waters by Light Absorption in the Ultraviolet Region, in Voprosy metodologii gidrokhimicheskikh issledovanii v usloviyakh antropogennogo vliyaniya. Mater. XXVII Vsesoyuz. gidrokhimicheskogo soveshch (Issues of Methodology of Hydrochemical Studies under the Conditions of Anthropogenic Impact. Trans. XXVII All-Union Hydrochem. Meeting), Leningrad: Gidrometeoizdat, 1979, part 1, pp. 108–109.
2. Varshal, G.M., Velyukhanova, T.K., Koshcheeva, I.Ya., et al., Studying Chemical Forms of Elements in Surface Waters, Zh. Anal. Khim., 1983, vol. 38, no. 9, pp. 1590–1600.
3. Krasyukov, V.N. and Lapin, I.A., USSR Inventor’s Certificate No. 1385041, Byull. Izobret., 1988, no. 12.
4. Kulish, T.P., Organic Matter in Ladoga Water and the Processes of Its Transformation, in Ladozhskoe ozero. Proshloe, nastoyashchee, budushchee (Ladoga Lake. The Past, Present, and Future), St. Petersburg: Nauka, 2002, pp. 107–111.
5. Lozovik, P.A. and Kovalenko, V.N., Northern Part of Ladoga Lake and Its Tributaries. Lake Water Chemistry, in Sovremennoe sostoyanie vodnykh ob’ektov respubliki Kareliya. Po rezul’tatam monitoringa 1992–1997 gg (Current State of Water Objects in the Republic of Karelia. Based on the Results of Monitoring of 1992–1997), Petrozavodsk: Izd. KarNTs RAN, 1998, pp. 76–84.