@article{article07bc7a06,
title   = {Nonclassical depth of the phase state},
author = {Marchiolli, M. A. and Bagnato, Vanderlei Salvador and Guimarães, Y. and Baseia, Basílio},
year = {2001},
doi = {10.1016/s0375-9601(01)00005-6},
journal   = {Physics Letters A}
}