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G. Carro, Y. K. Ng and L. Portinari, “On the Galactic Disc Age Metallicity Relation,” Monthly Notices of the Royal Astronomical Society, Vol. 296, No. 4, 1998, pp. 1045-1056. doi:10.1046/j.1365-8711.1998.01460.x

has been cited by the following article:

• TITLE: Why Do the Main Sequence Stars Have Similar Chemical Composition?

  AUTHORS: Stanislaw Halas, Tomasz Durakiewicz

  KEYWORDS: Stars; Quasars; Background Radiation; Jeans Criterion; Gravitational Contraction; Nebulae

  JOURNAL NAME: International Journal of Astronomy and Astrophysics, Vol.2 No.1, March 28, 2012

  ABSTRACT: In this short note we have reconsidered the Jeans criterion for gravitational contraction of a gas nebula at different temperatures, from the present-day background radiation temperature (2.8 K) to those which existed at the early stage of the Universe. We demonstrate that the initial mass of quasars cannot be of the order of single galaxy masses, but rather 106 solar mass only. If they have larger masses, it must be the result of subsequent accretion process. Nevertheless quasars, formed prior to the stars, were the immediate source of the elements heavier than helium.