共 5 条
[1]
GRAFF, 1926, ASTRONOMISCHE ABHAND, V2
[2]
KUHL, 1924, VIERTELJAHRSSCHR AST, V59, P196
[3]
TRUMPLER, 1927, LICK OBSERVATORY B, V13, P19
[4]
WRIGHT, 1926, LICK OBSERVATORY B, V13, P50
[5]
1926, NATURWISSENSCHAFTEN, V14, P16