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- [26] SEARCH FOR THERMAL X-RAY LINE EMISSION FROM CRAB-NEBULA ASTROPHYSICAL JOURNAL, 1977, 216 (01): : L27 - L29
- [27] X-RAY SPECTRAL FEATURES OF CRAB-NEBULA AND NP0532 NATURE-PHYSICAL SCIENCE, 1973, 246 (155): : 109 - 111