Cordes characterization for pseudodifferential operators with symbols valued in a noncommutative C*-algebra
Severino Toscano do Rego Melo Marcela Irene Merklen Olivera
Comptes rendus mathématiques de l’ Académie des Sciences de la Sociétè Royale du Canada Ottawa v. 31, n. 1, p. 24-32, 2009Ottawa 2009
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