@article{MZ_1971__122_171595,
     author = {Mitsuru Nakai and Leo Sario},
     title = {Dirichlet {Finite} {Biharmonic} {Functions} with {Dirichlet} {Finite} {Laplacians.}},
     journal = {Mathematische Zeitschrift},
     pages = {203--216},
     publisher = {mathdoc},
     volume = {122},
     year = {1971},
     zbl = {0263.31006},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__122_171595/}
}