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Astron. Astrophys. 319, 340-359 (1997) AcknowledgementsI would like to thank the referee, Kanaris Tsinganos, for his helpful comments, as well as Max Camenzind, Jean Heyvaerts, Stefan Appl, Ramon Khanna and Guy Pelletier for enthousiastic and stimulating discussions. This work was supported by the Deutsche Forschungsgemeinschaft (SFB 328). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |