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- [4] SECOND APPROXIMATION OF GENERALIZED WKB-METHOD .3. IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII FIZIKA, 1968, (11): : 108 - &
- [8] SOME NEW APPROACHES TO STUDY A GENERALIZED WKB-APPROXIMATION .3. IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII FIZIKA, 1974, (10): : 39 - 45