Media type: E-Article Title: Lagrange-Halbgruppen Contributor: Mertes, Helmut imprint: Springer Science and Business Media LLC, 1966 Published in: Archiv der Mathematik Language: German DOI: 10.1007/bf01900198 ISSN: 0003-889X; 1420-8938 Keywords: General Mathematics Origination: Footnote: