Pooley, D. and Lewin, W.H.G. and Verbunt, F. and Homer, L. and Margon, B. and Gaensler, B.M. and Kaspi, V.M. and Miller, J.M. and Fox, D.W. and van der Klis, M.
Cackett, E.M. and Wijnands, R. and Heinke, C.O. and Edmonds, P.D. and Lewin, W.H.G. and Pooley, D. and Grindlay, J.E. and Jonker, P.G. and Miller, J.M.