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- [8] BOUNDARY-CONDITIONS FOR DIFFERENTIAL APPROXIMATIONS JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 1981, 25 (04): : 325 - 337
- [10] THE DIFFERENTIAL-OPERATOR EQUATIONS OF THE 2ND-ORDER WITH IRREGULAR BOUNDARY-CONDITIONS DOKLADY AKADEMII NAUK SSSR, 1991, 320 (03): : 539 - 542