scientific article; zbMATH DE number 3351563
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zbMath0222.02068MaRDI QIDQ5626657
Publication date: 1970
Full work available at URL: http://www.numdam.org/item?id=SD_1968-1969__22_1_A4_0
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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