@article{702176,
     title = {On the solution of elliptic partial differential equations with an unbounded Dirichlet integral},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Publishing House of the Czechoslovak Academy of Sciences},
     address = {Prague},
     year = {1963},
     pages = {93-104},
     mrnumber = {MR0170092},
     zbl = {0163.34902},
     url = {http://dml.mathdoc.fr/item/702176}
}

Nečas, J. On the solution of elliptic partial differential equations with an unbounded Dirichlet integral, dans Differential Equations and Their Applications, GDML_Books,  (1963), pp. 93-104. http://gdmltest.u-ga.fr/item/702176/