@article{articlee41a9df9,
title   = {Phases of quantum states in completely positive non-unitary evolution},
author = {Faria, J G Peixoto de and Piza, Antonio Fernando Ribeiro de Toledo and Nemes, M C},
year = {2003},
doi = {10.1209/epl/i2003-00440-4},
journal   = {Europhysics Letters}
}