Non-commutative reduction rings. Madlener, Klaus; Reinert, Birgit — 1999 Revista Colombiana de Matemáticas
Espacios vectoriales topológicos sobre cuerpos no ar quimedianamente valuados Madlener E. Klaus — 1968 Revista colombiana de matematicas
Ideales de riesz en espacios localmente k-convexos Klaus Madlener — 1974 Revista colombiana de matematicas
String Matching And Algorithmic Problems In Free Groups. Klaus Madlener; Jürgen Avenhaus — 1980 Revista colombiana de matematicas
Commutativity in groups presented by finite Church-Rosser Thue systems Klaus Madlener; Friedrich Otto — 1988 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications