@article{MT_1996_31_a5,
     author = {V. B. Korotkov},
     title = {Some unsolved problems of the theory of integral operators},
     journal = {Matemati\v{c}eskie trudy},
     pages = {187--196},
     publisher = {mathdoc},
     volume = {31},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1996_31_a5/}
}