@article{PORMA_1970__29_4_115130,
     author = {Gupta, P.M. and Kulshreshtha, S.K.},
     title = {Functions of four variables which satisfy both the heat equation and the {Laplace} equation in three variables - {II}},
     journal = {Portugaliae mathematica},
     pages = {213--219},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1970},
     mrnumber = {0338560},
     zbl = {0217.40702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1970__29_4_115130/}
}