Rb-Sr systematics of Vendian-Cambrian claystones from the east European Platform : implications for a multi-stage illite evolutionGorokhov, I.M.; Clauer, N.; Turchenko, T.L.; Melnikov, N.N.; Kutyavin, E.P.; Pirrus, Enn-Aavo; Baskakov, A.V.Chemical geology1994 / p. 71-89: ill