NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T08:46:04 PDT
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For refcode 1989RMxAA..18..188T:
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Rev. Mexicana Astron. Astrof.
1989 vol. 18 p. 188
TORRES-PEIMBERT S., PEIMBERT M., FIERRO J.
Physical conditions of HII regions in M 101 and the pregalactic helium abundance
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