@article{MS2_1971__29_166216,
     author = {M. Nakai and L. Sario},
     title = {A {Property} of {Biharmonic} {Functions} with {Dirichlet} {Finite} {Laplacians.}},
     journal = {Mathematica Scandinavica},
     pages = {307--316},
     publisher = {mathdoc},
     volume = {29},
     year = {1971},
     zbl = {0246.31009},
     url = {http://geodesic.mathdoc.fr/item/MS2_1971__29_166216/}
}