Relação |
Bozilova, Elisaveta D B; Tonkov, Spassimir (1985): Paleoecological studies in Lake Durankulak. Annual of Sofia University, Faculty of Biology, 76(2), 25-29
Chakalova, E; Stojanova, D; Tonkov, Spassimir (1990): Plant macrofossil remains from the Chokljovo Marsh (Konjavska Mountains) (In Bulgarian). Annual of Sofia University, Faculty of Biology, 80(2), 41-47
Tonkov, Spassimir; Bozilova, Elisaveta D B (1992): Paleoecological investigation of Tchokljovo Marsh (Konjavska Mountains). Annual of Sofia University, Faculty of Biology, 83(2), 5-16
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