Grigorovich, 1971
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Grigorovich, A.S., 1971: Mikrofitoplankton melovykh i paleogenovykh otlozhenii severnogo sklona Ukrainskikh Karpat. Moskovskoe Obshchestvo Ispytatelei Prirody, Biulleten, Otdel Geologicheskii, v.46, no.2, p.83-98, pl.1-3.