Lexicographic sums and fibre-faithful maps. - Reinhard Börger; Walter Tholen; Anna Tozzi (Appl. Categorical Struct., 1993)

Facets of descent, I. - George Janelidze; Walter Tholen (Appl. Categorical Struct., 1994)

Quasi-coproducts and accessible categories with wide pullbacks. - Hongde Hu; Walter Tholen (Appl. Categorical Struct., 1996)

Facets of Descent, II. - George Janelidze; Walter Tholen (Appl. Categorical Struct., 1997)

Separated and Connected Maps. - Maria Manuel Clementino; Walter Tholen (Appl. Categorical Struct., 1998)

Representation of Relations by Partial Maps. - Xiaomin Dong; Walter Tholen (Appl. Categorical Struct., 2000)

Openness with Respect to a Closure Operator. - Eraldo Giuli; Walter Tholen (Appl. Categorical Struct., 2000)

What is a Quotient Map with Respect to a Closure Operator? - Maria Manuel Clementino; Eraldo Giuli; Walter Tholen (Appl. Categorical Struct., 2001)

Weak Factorization Systems and Topological Functors. - Jirí Adámek; Horst Herrlich; Jirí Rosický; Walter Tholen (Appl. Categorical Struct., 2002)

One Setting for All: Metric, Topology, Uniformity, Approach Structure. - Maria Manuel Clementino; Dirk Hofmann; Walter Tholen (Appl. Categorical Struct., 2004)

Preface. - George Janelidze; Bodo Pareigis; Walter Tholen (Appl. Categorical Struct., 2004)

Facets of Descent III: Monadic Descent for Rings and Algebras. - George Janelidze; Walter Tholen (Appl. Categorical Struct., 2004)

Universality of Coproducts in Categories of Lax Algebras. - Mojgan Mahmoudi; Christoph Schubert; Walter Tholen (Appl. Categorical Struct., 2006)

Introduction to the Special Issue "Aspects of Contemporary Topology II". - Eva Colebunders; Miroslav Husek; Hans-Peter A. Künzi; Walter Tholen (Appl. Categorical Struct., 2007)

A Topologist's View of Chu Spaces. - Eraldo Giuli; Walter Tholen (Appl. Categorical Struct., 2007)

Lawvere Completion and Separation Via Closure. - Dirk Hofmann; Walter Tholen (Appl. Categorical Struct., 2010)

Foreword - Special Issue Dedicated to the Memory of Professor Gregory Maxwell Kelly. - George Janelidze; Martin Hyland; Michael Johnson; Peter T. Johnstone; Stephen Lack; Ross Street; Walter Tholen; Richard J. Wood (Appl. Categorical Struct., 2011)

Foreword. - Maria Manuel Clementino; Marino Gran; Manuela Sobral; Ross Street; Walter Tholen (Appl. Categorical Struct., 2014)

Nullstellen and Subdirect Representation. - Walter Tholen (Appl. Categorical Struct., 2014)

The Fundamental Group as the Structure of a Dually Affine Space. - Eraldo Giuli; Walter Tholen (Appl. Categorical Struct., 2016)

Categorically Proper Homomorphisms of Topological Groups. - Wei He; Walter Tholen (Appl. Categorical Struct., 2016)

A Note on the Topologicity of Quantale-Valued Topological Spaces. - Hongliang Lai; Walter Tholen (Log. Methods Comput. Sci., 2017)

Approximate Injectivity. - Jirí Rosický; Walter Tholen (Appl. Categorical Struct., 2018)

Met-Like Categories Amongst Concrete Topological Categories. - Walter Tholen (Appl. Categorical Struct., 2018)

Categorical Extension of Dualities: From Stone to de Vries and Beyond, I. - Georgi D. Dimov; Elza Ivanova-Dimova; Walter Tholen (Appl. Categorical Struct., 2022)

Quotients of Span Categories that are Allegories and the Representation of Regular Categories. - S. N. Hosseini; A. R. Shir Ali Nasab; Walter Tholen; Leila Yeganeh (Appl. Categorical Struct., 2022)

Kan Extensions are Partial Colimits. - Paolo Perrone; Walter Tholen (Appl. Categorical Struct., 2022)