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- [5] HYPERBOLICITY CONDITIONS FOR SYSTEMS OF LINEAR PARTIAL-DIFFERENTIAL OPERATORS COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1991, 313 (05): : 227 - 230
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- [9] FORM OF GROUP-INVARIANT LINEAR PARTIAL-DIFFERENTIAL OPERATORS ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1978, 58 (07): : T369 - T370
- [10] ON HYPOELLIPTICITY AND SOLVABILITY OF LINEAR PARTIAL-DIFFERENTIAL OPERATORS WITH MULTIPLE CHARACTERISTICS INDAGATIONES MATHEMATICAE-NEW SERIES, 1993, 4 (02): : 223 - 238