@article{articleb3839421,
title   = {Modified nodal analysis applied to electric circuits coupled with FEM in the simulation of a universal motor},
author = {Costa, Maurício Caldora and Nabeta, Silvio Ikuyo and Cardoso, José Roberto},
year = {2000},
doi = {10.1109/20.877707},
journal   = {IEEE Transactions on Magnetics}
}