Optical positions of radio emitting stars M. Assafin, A. H. Andrei, S. P. Puliaev, E. G. Jilinski, R. Vieira Martins, G. G. Vieira and W. M. de Oliveira Astron. Astrophys. Suppl. Ser., 117 2 (1996) 335-342 Published online: 15 June 1996 DOI: 10.1051/aas:1996160