@article{CMH_1972__47_139519,
     author = {Cecilia Wang and LeoSario},
     title = {Parapolicity and existence of bounded biharmonic functions},
     journal = {Commentarii mathematici Helvetici},
     pages = {341--347},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139519/}
}