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- [9] DIFFERENTIAL-OPERATORS FOR SYSTEMS OF LINEAR PARTIAL-DIFFERENTIAL EQUATIONS ANNALI DI MATEMATICA PURA ED APPLICATA, 1992, 162 : 263 - 279
- [10] BOUNDARY-VALUE PROBLEMS FOR SOME MULTIDIMENSIONAL SYSTEMS OF 1ST-ORDER PARTIAL-DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1977, 236 (05): : 1049 - 1052