@article{701871,
     title = {Extensions of operators and the Dirichlet problem in potential theory},
     booktitle = {Proceedings of the 13th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1985},
     pages = {[143]-163},
     mrnumber = {MR0894279},
     zbl = {0626.31003},
     url = {http://dml.mathdoc.fr/item/701871}
}

Netuka, Ivan. Extensions of operators and the Dirichlet problem in potential theory, dans Proceedings of the 13th Winter School on Abstract Analysis, GDML_Books,  (1985), pp. [143]-163. http://gdmltest.u-ga.fr/item/701871/