Valeva, M.T. & Temniskova-Topalova, D.N. (1993). Diatom analysis of the Neogene sediments from the Karlovo coal basin. I. Fitologija (Bulgarska Akademiiana Naukite = Bulgarian Academy of Sciences), 46: 67-82, 4 pls.
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Valeva, M.T. & Temniskova-Topalova, D.N.
1993
Diatom analysis of the Neogene sediments from the Karlovo coal basin. I.
Fitologija (Bulgarska Akademiiana Naukite = Bulgarian Academy of Sciences)