@article{FAA_2021_55_2_a3,
     author = {A. V. Sobolev},
     title = {On the spectrum of the one-particle density matrix},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {44--54},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2021_55_2_a3/}
}