@article{article21208d0c,
title   = {Comments on spin operators and spin-polarization states of 2+1 fermions},
author = {Gavrilov, Serguei Petrovich and Gitman, Dmitri Maximovitch and Tomazelli, J L},
year = {2005},
doi = {10.1140/epjc/s2004-02026-9},
journal   = {European Physical Journal C}
}