@article{MZM_1984_35_2_a4,
     author = {V. E. Kruglov},
     title = {Structure of the partial indices of the {Riemann} problem with permutation-type matrices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {169--175},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1984_35_2_a4/}
}