@article{FAA_2023_57_2_a8,
     author = {M. M. Malamud},
     title = {On the {Birman} problem in the theory of nonnegative symmetric operators with compact inverse},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {111--116},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2023_57_2_a8/}
}