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- [6] NEW INTEGRAL-EQUATION FOR QUARTIC ANHARMONIC-OSCILLATOR LETTERE AL NUOVO CIMENTO, 1974, 9 (14): : 533 - 536
- [8] THE SPECTRAL BEHAVIOR OF A GENERAL DAMPED ANHARMONIC-OSCILLATOR PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1986, 136 (02): : 693 - 698