1,2,4-Triazolium Salts from the Reaction of 1-Aza-2-azoniaallene Salts with Nitriles - Wang, Quanrui; Jochims, Johannes C; Köhlbrandt, Stefan; Dahlenburg, Lutz; Al-Talib, Mahmound; Hamed, Atef; Ismail, Abd El-Hamid (Synthesis, 1992)