@article{ZNSL_2022_519_a3,
     author = {A. I. Karol},
     title = {Singular values of compact pseudodifferential operators of variable order with nonsmooth symbol},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {67--104},
     publisher = {mathdoc},
     volume = {519},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2022_519_a3/}
}