Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 49, No. 1, pp. 131 (2008) 

Automorphisms of Verardi groups: Small upper triangular matrices over ringsTheo Grundhöfer and Markus StroppelMathematisches Institut, Universität Würzburg, Am Hubland, D97074 Würzburg, Germany; Institut für Geometrie und Topologie, Universität Stuttgart, D70550 Stuttgart, GermanyAbstract: Verardi's construction of special groups of prime exponent is generalized, and put into a context that helps to decide isomorphism problems and to determine the full group of automorphisms (or at least the corresponding orbit decomposition). The groups in question may be interpreted as groups of unitriangular matrices over suitable rings. Finiteness is not assumed. Full text of the article:
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