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ARDEBERG A, 1973, ASTRON ASTROPHYS, V28, P295
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BARBON R, 1972, IAU2411 CIRC
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BOTTINELLI L, 1972, ASTRON ASTROPHYS, V17, P445
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HERBIG G, 1972, IAU2407 CIRC
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KOWAL CT, 1972, IAU2405 CIRC
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OPTICAL OBSERVATIONS OF SUPERNOVA IN NGC 5253
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[10]
SHKLOVSKY IS, 1968, SUPERNOVAE, P20