@article{RM_1991_46_5_a10,
     author = {I. M. Oleinik},
     title = {On the existence of a~self-adjoint {Schr\"odinger} operator on a~spherically symmetric manifold},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {195--196},
     publisher = {mathdoc},
     volume = {46},
     number = {5},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1991_46_5_a10/}
}