@article{PIM_1972_N_S_13_27_a16,
     author = {J. L. Schiff},
     title = {Rotation-Free {Solutions} {With} {Positive} {Infimum} {Of} {The} {Equation} {\ensuremath{\Delta}u} = {Pu} {In} {A} {Neighbourhood} {Of} {A} {Singularity} {Of} {The} {Density} {P}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {117 },
     publisher = {mathdoc},
     volume = {_N_S_13},
     number = {27},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_13_27_a16/}
}