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- [26] SEARCH FOR PULSED GAMMA-RAY EMISSION ABOVE 50 MEV FROM CRAB-NEBULA PULSAR NP-0532 ASTRONOMY & ASTROPHYSICS, 1972, 16 (03): : 443 - +
- [28] SEARCH FOR GAMMA RAYS WITH ENERGY '= 15 MEV FROM M87 AND CRAB NEBULA BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1971, 16 (04): : 535 - &