%0 Journal Article %A M. F. Kulagina %A I. G. Salekhova %T The Riemann problem in the case of a countable set of contours that are periodically spaced in the right half-plane %J Trudy seminara po kraevym zadačam %D 1976 %P 175-183 %V 13 %N 13 %I mathdoc %U http://geodesic.mathdoc.fr/item/KUKZ_1976_13_13_a19/ %G ru %F KUKZ_1976_13_13_a19