@article{JNSA_2014_7_5_a5,
     author = {Wang, Faxing and Shen, Yonghong},
     title = {On the {Ulam} stability of a quadratic set-valued functional equation },
     journal = {Journal of nonlinear sciences and its applications},
     pages = {359-367},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {2014},
     doi = {10.22436/jnsa.007.05.06},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.22436/jnsa.007.05.06/}
}