@article{DE_1975_11_3_a3,
     author = {V. I. Mossakovskii and A. A. Novopashin and A. G. Biskup},
     title = {Certain aspects of the {Riemann} problem for the case of an equation with four singular points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {445--455},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_3_a3/}
}