A Unified Functional Look at Completion in MET, UNIF and AP. - Robert Lowen; Mark Sioen (Appl. Categorical Struct., 2000)

On the Epireflectivity of the Wallman-Shanin-Type Compactification for Approach Spaces. - Mark Sioen (Appl. Categorical Struct., 2000)

Non-symmetric Exponential Laws in the Construct PRTOP. - Mark Sioen (Appl. Categorical Struct., 2002)

Cartesian Closedness, Extensionality and Bornological Universes. - Mark Sioen; Tom Vroegrijk (Appl. Categorical Struct., 2014)

An Alternative Description of Approach Spaces Via Approach Cores. - Mark Sioen; W. Van Den Haute (Appl. Categorical Struct., 2016)

Normality, Regularity and Contractive Realvalued Maps. - Eva Colebunders; Mark Sioen; W. Van Den Haute (Appl. Categorical Struct., 2018)