共 10 条
- [1] Russell H N, 1940, Science, V92, P19, DOI 10.1126/science.92.2376.19
- [2] *YERK OBS, 1927, YERK OBS PUB 2, V5, P34
- [3] 1937, RUSSIAN ASTR, V14, P207
- [4] 1942, AP J, V95, P201
- [5] 1937, RUSSIAN ASTR J, V14, P207
- [6] 1936, NATURE, V137, P537
- [7] 1929, ASTRONOMY COSMOGONY, V323
- [8] 1919, MN, V79, P100
- [9] 1935, NATURE, V136, P432
- [10] 1919, MN, V79, P408