共 8 条
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- [2] KUIPER GP, 1938, AP J, V88, P486
- [3] MERRILL, 1940, SPECTRA LONG PERIOD
- [4] MORGAN WW, 1938, AP J, V87, P592
- [6] OHMAN Y, 1935, AP J, V80, P171
- [7] 1936, STOCKHOLMS OBS ANN, V12
- [8] 1935, AP J, V81, P187