Gary Steigman (1941-), David Schramm (1945-1997), and James Gunn (1938-) examine the relation between the primordial helium abundance and number of neutrinos and claim that at most five lepton families can exist
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Citation: Editors, Litencyc. "Existence of five lepton families suggested". The Literary Encyclopedia. First published 01 May 2009 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=6732, accessed 23 November 2024.]
