Geodesic
Zeros of eigenfunctions of the Schrödinger operator with a singular potential
Differencialʹnye uravneniâ, Tome 26 (1990) no. 11, pp. 2000-2002 
R. R. Ashurov. Zeros of eigenfunctions of the Schrödinger operator with a singular potential. Differencialʹnye uravneniâ, Tome 26 (1990) no. 11, pp. 2000-2002. http://geodesic.mathdoc.fr/item/DE_1990_26_11_a22/
@article{DE_1990_26_11_a22,
     author = {R. R. Ashurov},
     title = {Zeros of eigenfunctions of the {Schr\"odinger} operator with a singular potential},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2000--2002},
     year = {1990},
     volume = {26},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_11_a22/}
}
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