POLARIZATION MEASUREMENT OF SIGMA+ PRODUCED IN LINE-REVERSED REACTIONS PI+P-]K+SIGMA+ AND K-P-]PI-SIGMA+ AT 7 AND 11.6 GEV-C - BAKER,PA; CHIMA,JS; DORNAN,PJ; GIBBS,DJ; HALL,G; MILLER,DB; VIRDEE,TS; WHITE,AP; BALLAM,J; BOUCHEZ,J; CARROLL,JT; CAUTIS,CV; et al. (PHYSICAL REVIEW LETTERS, 1978)