@article{EJDE_2015__2015__a89,
     author = {Haoua, Rabah and Medeghri, Ahmed},
     title = {Robin boundary value problems for elliptic operational differential equations with variable coefficients},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2015},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a89/}
}