Convexity theories IV. Klein-Hilbert parts in convex modules. - D. Pumplün; Helmut Röhrl (Appl. Categorical Struct., 1995)

Convexity Theories V: Extensions of Absolutely and Totally Convex Modules. - D. Pumplün; Helmut Röhrl (Appl. Categorical Struct., 2000)

On N-Summations, I. - Jay Fillmore; D. Pumplün; Helmut Röhrl (Appl. Categorical Struct., 2002)

Banach Limits of Locally Bounded Real Functions on Hausdorff Spaces. - Diethard Pallaschke; D. Pumplün (Appl. Categorical Struct., 2016)