@article{articled6a28232,
title   = {Observation of double electron-positron pair production by `gama´ rays reexamined},
author = {Maidana, Nora Lia and Brualla, L and Oliveira, José Roberto Brandão de and Rizzutto, Márcia de Almeida and Added, Nemitala and Fernandez-Varea, J M and Vanin, Vito Roberto},
year = {2009},
journal   = {Physical Review C}
}