@article{articlec7e10566,
title   = {Validity of Feynman´s prescription of disregarding the Pauli principle in intermediate states},
author = {Coutinho, Francisco Antônio Bezerra and Nogami, Y. and Tomio, Lauro},
year = {1999},
doi = {10.1103/physreva.59.2624},
journal   = {Physical Review A}
}