TRANSFORMATION OF 2-ETHYL-1-M-FLUORO-PHENYL-Β-CARBOLINE BY THE ACTION OF DIMETHYL ACETYLENEDICARBOXYLATE IN THE PRESENCE OF INDOLES. NEW METHOD OF SYNTHESIS OF BISINDOLYLARYLMETHANES СтатьяVoskressensky L.G., Kulikova L.N., Kasatochkina A.S., Listratova A.V., Toze F.A., Borisova T.N., Varlamov A.V.Chemistry of Heterocyclic Compounds. Том 46. 2010. С. 1013-1015