共 5 条
[2]
DUGAN RS, 1928, PRINC U OBS CONTR, P8
[3]
PICKERING EC, 1908, 139 HARV CIRC
[4]
SCHILT J, 1925, BAN, V3, P63
[5]
SHAPLEY H, 1915, PRINC U OBS CONTR, P3