Category 2, Hetarenes and Related Ring Systems - Grimmett,M. R.; Hajos,G.; Karaghiosoff,K.; Mathey,F.; Riedl,Z.; Schmidpeter,A.; Stadlbauer,W.; Stanovnik,B.; Svete,J. (Five-Membered Hetarenes with Two Nitrogen or Phosphorus Atoms, 2002)
Keywords: Nitrogen; Atoms