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O mezhkontinental'noi korrelyatsii srednedevonskoi podzony Elenisporis biformis / Intercontinental correlation of the Lower
Devonian Elenisporis biformis subzone; McGregor, D C; Richardson, J B; Arkhangelskaya, A D. Doklady Akademii nauk SSSR vol. 310,
no. 5, 1990 p. 1192-1194 (GSC Cont.# 22888)