@article{articleb80f7f30,
title   = {Two-level systems: exact solutions and underlying pseudo-supersymmetry},
author = {Shamshutdinova, V V and Samsonov, Boris F and Gitman, Dmitri Maximovitch},
year = {2007},
doi = {10.1016/j.aop.2006.05.004},
journal   = {Annals of Physics}
}