Geodesic
On the nodes of the eigenfunctions of the Schrödinger operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 1 
G. M. Zhislin. On the nodes of the eigenfunctions of the Schrödinger operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 1. http://geodesic.mathdoc.fr/item/RM_1961_16_1_a9/
@article{RM_1961_16_1_a9,
     author = {G. M. Zhislin},
     title = {On the nodes of the eigenfunctions of the {Schr\"odinger} operator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1961},
     volume = {16},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_1_a9/}
}
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