@article{KUKZ_1980_17_17_a10,
     author = {B. A. Kats},
     title = {On the {Riemann} problem with a coefficient admitting a singularity of the null-pole type},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {89--99},
     publisher = {mathdoc},
     volume = {17},
     number = {17},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1980_17_17_a10/}
}