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Bolibrukh, A.A. (1992). "Sufficient conditions for the positive solvability of the Riemann-Hilbert problem". Matematicheskie Zametki (in Russian). 51 (2): 110–117. doi:10.1007/BF02102113. MR1165460. S2CID121743184.
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Bolibrukh, A.A. (1992). "Sufficient conditions for the positive solvability of the Riemann-Hilbert problem". Matematicheskie Zametki (in Russian). 51 (2): 110–117. doi:10.1007/BF02102113. MR1165460. S2CID121743184.
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Serrin, James (1969-05-08). "The problem of Dirichlet for quasilinear elliptic differential equations with many independent variables". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 264 (1153): 413–496. Bibcode:1969RSPTA.264..413S. doi:10.1098/rsta.1969.0033. ISSN0080-4614.