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Varsányi Zoltánné; Bertalan Balogh M.: Humic acid as an indicator of subsurface water movements. In: Acta mineralogica-petrographica, (27). pp. 171-174. (1985)
Varsányi Zoltánné: Humic acids in subsurface waters from the Southern Great Plain, Hungary. In: Acta mineralogica-petrographica, (27). pp. 165-170. (1985)