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- [29] THE USE OF 1ST INTEGRALS IN PROBLEMS OF SYNTHESIZING OPTIMAL-CONTROL SYSTEMS PMM JOURNAL OF APPLIED MATHEMATICS AND MECHANICS, 1986, 50 (01): : 11 - 16
- [30] NOTES ON CONNECTION BETWEEN SYMMETRIES AND 1ST INTEGRALS OF DYNAMICAL-SYSTEMS LETTERE AL NUOVO CIMENTO, 1977, 19 (10): : 366 - 368