The norm of uniform convergence on the k -algebraic maximal spectrum of an algebra over a non-archimedean valuation field k Ulrich Güntzer — 1974 Mémoires de la Société Mathématique de France
Kahl bewertete Ringe in der nicht-archimedischen Analysis. Reinhold Remmert; Ulrich Güntzer — 1973 Manuscripta mathematica