Geodesic
Existence of positive eigenfunctions of linear positive operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 17 (1962) no. 5 
I. A. Bakhtin. Existence of positive eigenfunctions of linear positive operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 17 (1962) no. 5. http://geodesic.mathdoc.fr/item/RM_1962_17_5_a18/
@article{RM_1962_17_5_a18,
     author = {I. A. Bakhtin},
     title = {Existence of positive eigenfunctions of linear positive operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1962},
     volume = {17},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1962_17_5_a18/}
}
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