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@article{IVM_1971_3_a13, author = {L. I. Chibrikova}, title = {On the solution of the {Riemann} problem in singular {cases.~I}}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {101--113}, publisher = {mathdoc}, number = {3}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1971_3_a13/} }
L. I. Chibrikova. On the solution of the Riemann problem in singular cases.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1971), pp. 101-113. http://geodesic.mathdoc.fr/item/IVM_1971_3_a13/