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- [1] BOUNDARIES FOR LEFT-INVARIANT SUBELLIPTIC OPERATORS ON SEMIDIRECT PRODUCTS OF NILPOTENT AND ABELIAN-GROUPS JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1990, 411 : 1 - 38
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- [4] ON COERCIVITY OF DEGENERATE ELLIPTIC-OPERATORS DOKLADY AKADEMII NAUK SSSR, 1988, 298 (01): : 29 - 31