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On a theorem of H. Zieschang

Abstract AuthorsGh. Calugareanu Institutul de Calcul Keywords? Paper coordinatesGh. Călugăreanu, Sur un théorème de H. Zieschang, L’Enseignement mathématique, XXI, 1…

On certain invariants attached to countable groups

Abstract AuthorsGh. Calugareanu Institutul de Calcul Keywords? Paper coordinatesGh. Călugăreanu, Sur certains invariants attachés aux groupes dénombrables, Mathematica – Revue d’Analyse…