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- [7] DARBOUX TYPE PROBLEM FOR A CLASS OF FOURTH-ORDER NONLINEAR HYPERBOLIC EQUATIONS MEMOIRS ON DIFFERENTIAL EQUATIONS AND MATHEMATICAL PHYSICS, 2023, 89 : 39 - 59
- [9] THE DARBOUX-PROBLEM IN R3 FOR A CLASS OF DEGENERATED HYPERBOLIC-EQUATIONS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1988, 41 (11): : 7 - 9