共 14 条
[5]
GREWING M, TO BE PUBLISHED
[6]
GUELIN M, IN PRESS
[7]
HAZARD C, 1972, ASTROPHYS LETT COMM, V11, P77
[8]
HOLMBERG E, 1958, MEDD LUNDS ASTR OB 2
[10]
NILSON P, 1973, UPPSALA ASTRON OBS A, V6