@article{FAA_1972_6_3_a14,
     author = {G. A. Kalyabin},
     title = {On the number of solutions of a self-adjoint system of second-order differential equations in $L_2(0,\infty)$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {74--76},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_3_a14/}
}