2 citations to https://www.mathnet.ru/rus/into350
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S Ya Startsev, “Darboux integrability of hyperbolic partial differential equations: is it a property of integrals rather than equations?”, J. Phys. A: Math. Theor., 58:2 (2025), 025206
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S. Ya. Startsev, “On Bäcklund Transformations Preserving the Darboux Integrability of Hyperbolic Equations”, Lobachevskii J Math, 44:5 (2023), 1929