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Patent EP0427595A1: Process for the synthesis of cyclic polynitrogenated compounds. Angemeldet am 31. Oktober 1990, veröffentlicht am 15. Mai 1991, Anmelder: L’Air Liquide S.A., Erfinder: R. Guilard, I. Meunier, C. Jean, B. Boisselier-Cocolios.
