A survey of blue and red stars in the field of 30'x30' around the M 81 galaxy. Bilkina, B. I. ; Getov, R. G. ; Georgiev, Ts. B. Abstract Publication: Soobshcheniya Spetsial'noj Astrofizicheskoj Observatorii Pub Date: 1991 Bibcode: 1991SoSAO..67..119B