1. ;;The composition of cometary volatiles;Bockelée-Morvan,2004
2. Cochran, W.D., Cochran, A.L. NH2 in comet Halley, in: Lagerkvist, C.I., Rickman, H., Lindblad, B.A. (Eds.), Asteroids, Comets, Meteors III, Proceedings of a Meeting (AMC 89), Uppsala: Universitet, Sweden, p. 289, 1990.
3. Dynamic coma models for comet Bennett 1970 II;Cucchiaro;Astron. Astrophys.,1982
4. Le spectre de la comète Burnham (1959 k);Dossin;Ann. d’Astrophysique,1961
5. The abundance of ammonia in comet P/Halley derived from ultraviolet spectrophotometry of NH by ASTON and IUE;Feldman;Astrophys. J.,1993