Direct fusion of a triazine to a pyrazine ring. Synthesis of derivatives of [1,2,4]triazino[5,6-b]quinoxaline / V. N. Charushin, V. G. Baklykov, O. N. Chupakhin, L. M. Naumova // Chemistry of Heterocyclic Compounds. - 1984. - Vol. 20, № 9. - P. 1057-1058. - Bibliogr. : p. 1058 (2 ref.).