SYNTHESIS OF 3-ALKYL-2, 4, 6-TRIPHENYLPYRIDINES AND 1,3-DIPHENYL-4- AND-2-AZAFLUORENES СтатьяProstakov N.S., Vasil'ev G.A., Zvolinskii V.P., Varlamov A.V., Savina A.A., Sorokin O.I., Lopatina N.D.Chemistry of Heterocyclic Compounds. Том 11. 1975. С. 971-975