@article{CMJ_2007_57_3_a7,
     author = {Abkar, Ali},
     title = {On the integral representation of superbiharmonic functions},
     journal = {Czechoslovak Mathematical Journal},
     pages = {877--883},
     year = {2007},
     volume = {57},
     number = {3},
     mrnumber = {2356287},
     zbl = {1174.31302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2007_57_3_a7/}
}