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VOLUME 33 (1981) | ISSUE 12 | PAGE 667
Note regarding the observation of quark-type fractional electric charges
Expansion of the charge spectrum of quarks and leptons leads to grand unified models whose electroweak sector contains a second neutral boson with a mass S 90 GeV. This boson may already be of experimental interest. A method is suggested for measuring the masses of new, heavy quarks and leptons.