scientific article; zbMATH DE number 3233112
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Publication:5520982
zbMath0144.35602MaRDI QIDQ5520982
Publication date: 1964
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
multiply-connected domainexterior differential formsPfaff formsglobal existence of Bianchi's normal formsecond-order elliptic linear differential operator in two variables
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