Cosmological Lower Bound on Heavy-Neutrino Masses
Benjamin W. Lee and Steven Weinberg
Phys. Rev. Lett. 39, 165 (1977) - Published 25 July, 1977
Cosmological Upper Bound on Heavy-Neutrino Lifetimes
Duane A. Dicus, Edward W. Kolb, and Vigdor L. Teplitz
Phys. Rev. Lett. 39, 168 (1977) - Published 25 July, 1977