Geodesic
The determination of basis functions of the operator perturbed by the unit rank operator
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 1 (2006), pp. 75-80 
M. A. Klochkov. The determination of basis functions of the operator perturbed by the unit rank operator. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 1 (2006), pp. 75-80. http://geodesic.mathdoc.fr/item/VUU_2006_1_a6/
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     author = {M. A. Klochkov},
     title = {The determination of basis functions of the operator perturbed by the unit rank operator},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {75--80},
     year = {2006},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2006_1_a6/}
}
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We study the completеness problem of the system of eigenfunctions of the self-adjoint operator with simple pure point spectrum.