@article{articlebabc5abd,
title   = {An improved wide-angle FD-BPM for nonlinear and nonreciprocal waveguides},
author = {Alcantara, Licinius Dimitri Sá de and Teixeira, Fernando Lisboa and Cesar, Amilcar Careli and Borges, Ben-Hur Viana},
year = {2003},
doi = {10.1109/tmag.2003.810537},
journal   = {IEEE Transactions on Magnetics}
}