共 9 条
[1]
BAUM WA, 1955, SKY TELESCOPE, V14, P264
[2]
BAUM WA, 1955, SKY TELESCOPE, V14, P330
[6]
GREENWOOD, 1948, ELECTRONIC INSTRUMEN, V21, P78
[9]
WOOD FB, 1953, ASTRONOMICAL PHOTOEL, P131