@article{ChristlLanzendoerferGroetschetal.1993,
  author    = {Manfred Christl and U. Lanzend{\"o}rfer and M. M. Gr{\"o}tsch and J. Hegmann and E. Ditterich and G. H{\"u}ttner and K. Peters and E.-M. Peters and H. G. von Schnering},
  title     = {Cycloadditionen von 6H-1,3,4-0xadiazin-6-onen (4,5-Diaza-α-pyronen), 12 - Dieckmann-Kondensationen ohne Basen},
  year      = {1993},
}