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Astron. Astrophys. 331, 1099-1102 (1998) AcknowledgementsThis work was supported by PPARC through Graduate Studentships (MPR, BRF) and a Standard Grant Research Associateship (RJRW). JED is grateful to the Australian National University Theory Centre for support of a visit during which part of this work was carried out. An anonymous referee made thoughtful comments.
© European Southern Observatory (ESO) 1998 Online publication: March 3, 1998 ![]() |