TY - JOUR AU - Lamers, H AU - Maeder, A AU - Schmutz, W AU - Cassinelli, J C2 - Astrophysical Journal DA - 1991-01-01 LA - en M1 - 368 PB - Astrophysical Journal PY - 1991 TI - Wolf-Rayet stars as starting points or as endpoints of the evolution of massive stars? ER -