@article{JRAM_1963__212_150576,
     author = {R.P. Gilbert},
     title = {On {Generalized} {Axially} {Symmetric} {Potentials.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {158--168},
     year = {1963},
     volume = {212},
     zbl = {0123.29203},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1963__212_150576/}
}