CODATA Recommended Values of the Fundamental Physical Constants:2014 Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD), http://webbook.nist.gov , arXiv:https://arxiv.org/pdf/1507.07956v1.pdf
CODATA Recommended Values of the Fundamental Physical Constants:2014 Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD), http://webbook.nist.gov , arXiv:https://arxiv.org/pdf/1507.07956v1.pdf