Observation of double electron-positron pair production by `gama´ rays reexamined
Nora Lia Maidana L Brualla; J. R. B Oliveira (José Roberto Brandão); Marcia de Almeida Rizzutto; Nemitala Added; J M Fernandez-Varea; Vito Roberto Vanin
Physical Review C v. 79, n. 4, p. 048501/1-048501/4, 2009