First linear polarization spectra of wolf-rayet stars in the ultraviolet: ez canis majoris and o muscae - Shulte-Ladbeck, R E; Nordsieck, K H; Code, A D; Anderson, C M; Babler, B L; Bjorkman, K S; Clayton, G C; Magalhães, Antonio Mário; Meade, M R; Shepherd, D; Taylor, M; Whitney, B A (Astrophysical Journal, 1992)