@inproceedings{inproceedings6300fa52,
title   = {Transformation of electron neutrinos to - meson neutrinos in the early universe and its effect on primordial nucleosynthesis},
author = {Opher, E and Opher, Reuven},
year = {1993},
publisher = {Inpe/Fapesp/Finep/Banco Real},
booktitle   = {Encontro Brasileiro de Fisica dos Plasmas}
}