@article{PORMA_1994__51_3_47172,
     author = {Grossinho, M.R. and Ma, T.F.},
     title = {Symmetric equilibria for a beam with a nonlinear elastic foundation.},
     journal = {Portugaliae mathematica},
     pages = {375--393},
     publisher = {mathdoc},
     volume = {51},
     number = {3},
     year = {1994},
     zbl = {0815.34014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1994__51_3_47172/}
}