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- [46] THE SUMMATION OF THE PERTURBATION-THEORY SERIES DOKLADY AKADEMII NAUK SSSR, 1982, 264 (02): : 330 - 333
- [50] NONSTATIONARY EXCHANGE PERTURBATION-THEORY ZHURNAL TEKHNICHESKOI FIZIKI, 1990, 60 (04): : 15 - 21