1. Allard F., 1994, In: P. Thejll & U. G. Jorgensen (eds.), Poster session proceedings of IA U Cold. 146, Copenhagen University, p. 1
2. Birnbaum G., Chu S.-I., Dalgarno A., Frommhold L., Wright, E. L., 1984, Phys. Rev., 29A, 595
3. Birnbaum G. (ed.), 1985, Phenomena Induced by Intermolecular Interactions, NATO ASI Series, B: Physics, (New York: Plenum Press), vol. 127
4. Borysow A., 1993, unpublished
5. Borysow A., Frommhold L., 1989, Astrophys. J., 341, 549