Determination of the primordial helium abundance from radio recombination line observations: New data. The source W51

Author： Tsivilev A.   Parfenov S.   Sobolev A.   Krasnov V.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1063-7737

Source： Astronomy Letters, Vol.39, Iss.11, 2013-11, pp. : 737-745

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