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- [3] STABILITY OF SOLUTIONS TO DIFFERENTIAL EQUATIONS WITH NONLINEAR POTENTIAL OPERATOR IN HILBERT SPACE DOKLADY AKADEMII NAUK SSSR, 1973, 208 (01): : 21 - 24
- [4] ON NONLINEAR DIFFERENTIAL EQUATIONS IN HILBERT SPACES AMERICAN MATHEMATICAL MONTHLY, 1969, 76 (09): : 1024 - &