@article{articlecd662dfb,
title   = {Reduction of finite-element models of planar frames using non-linear normal modes},
author = {Mazzilli, Carlos Eduardo Nigro and Soares, Mário Eduardo Senatore and Baracho Neto, Odulpho Goyana de Paiva},
year = {2001},
doi = {10.1016/s0020-7683(00)00148-7},
journal   = {International Journal of Solids and Structures}
}