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- [5] X-RAYS FROM G74.9+1.2 - AN ELDERLY CRAB-NEBULA ASTROPHYSICAL JOURNAL, 1980, 241 (01): : L19 - L22
- [9] SEARCH FOR SOFT-X-RAY SOURCES IN GALACTIC ANTICENTER - ABSORPTION OF X-RAYS FROM CRAB-NEBULA ASTROPHYSICAL JOURNAL, 1974, 187 (03): : 505 - 510