Reactions of azinium cations. 6. N(1)-alkyl-1,2,4-triazinium salts. Reactions with indoles — The first case of the double addition of nucleophiles to a triazine ring / S. G. Alekseev, V. N. Charushin, O. N. Chupakhin, S. V. Shorshnev, A. I. Chernyshev, N. A. Klyuev // Chemistry of Heterocyclic Compounds. - 1986. - Vol. 22, № 11. - P. 1242-1249. - Bibliogr. : p. 1249 (31 ref.).