The distribution of early type stars in the direction of stellar associations PER OB1, SCO OB1 and CYG OB1. Tovmassian, H. M. ; Hovhannessian, R. Kh. ; Epremian, R. A. ; Huguenin, D. Abstract Publication: Astrofizika Pub Date: 1990 Bibcode: 1990Afz....33..329T