Comprehensive heterocyclic chemistry: The structure, reactions, synthesis and uses of heterocyclic compounds / Pergamon Press, volume 5, part 4A, five-membered rings with two or more nitrogen atom - Oxford: Pergamon Press, 1984 - xvi, 994p. Subjects--Topical Terms: Chemistry Subjects--Index Terms: Science Universal Decimal Class. No.: R 547.7/8 / M4.5