共 6 条
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- [2] HILTNER WA, 1962, ASTRONOMICAL TECH ED, P157
- [3] HILTNER WA, 1962, ASTRONOMICAL TECH ED, P178
- [4] JOHNSON HL, 1962, ASTRONOMICAL TECHNIQ, P157
- [5] ROBINSON I, 1965, QUASISTELLAR SOUR ED, P221
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