@article{article55b939ad,
title   = {An outline of the natural force density method and its extension to quadrilateral elements},
author = {Pauletti, Ruy Marcelo de Oliveira and Fernandes, Fagner Lopes},
year = {2020},
doi = {10.1016/j.ijsolstr.2019.09.003},
journal   = {International Journal of Solids and Structures}
}