@article{EJDE_2004__2004__a123,
     author = {El Kadiri,  Mohamed},
     title = {Liouville's theorem and the restricted mean property for biharmonic functions},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1084.31003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a123/}
}