1. Boggess, A. and Wilson, R.: 1987, in Y. Kondo (ed.), Exploring the Universe with the IUE Satellite, D. Reidel Publ. Co., Dordrecht, Holland, p. 3.
2. Bruch, A.: 1984, Astron. Astrophys. Suppl. 56, 441.
3. Harris, A. W. and Sonneborn, G.: 1987, in Y. Kondo (ed.), Exploring the Universe with the IUE Satellite, D. Reidel Publ. Co., Dordrecht, Holland, p. 729.
4. Holm, A. V. and Rice, G.: 1981, NASA IUE Newsletter 15, 74.
5. la Dous, C.: 1989, in M. Hack (ed.), ‘Dwarf Novae and Nova-Like Stars’, Cataclysmic Variables, NASA/CNRS Monograph Series on Non-Thermal Phenomena in Stellar Atmospheres.