Semi-abelian categories G Janelidze, L Márki, W Tholen Journal of Pure and Applied Algebra 168 (2-3), 367-386, 2002 | 401 | 2002 |

Categorical structure of closure operators: with applications to topology, algebra and discrete mathematics D Dikranjan, W Tholen Springer Science & Business Media, 2013 | 327 | 2013 |

Monoidal Topology: A Categorical Approach to Order, Metric, and Topology D Hofmann, GJ Seal, W Tholen Cambridge University Press, 2014 | 188 | 2014 |

Categorical algebraic properties. A compendium on amalgamation, congruence extension, epimorphisms, residual smallness, and injectivity EW Kiss, L Márki, P Pröhle, W Tholen Studia Sci. Math. Hungar 18 (1), 79-141, 1983 | 172 | 1983 |

Facets of descent, I G Janelidze, W Tholen Applied Categorical Structures 2, 245-281, 1994 | 151 | 1994 |

Exponentiable morphisms, partial products and pullback complements R Dyckhoff, W Tholen Journal of Pure and Applied Algebra 49 (1-2), 103-116, 1987 | 114 | 1987 |

Metric, topology and multicategory—a common approach MM Clementino, W Tholen Journal of Pure and Applied Algebra 179 (1-2), 13-47, 2003 | 111 | 2003 |

Topology in a category: compactness MM Clementino, E Giuli, W Tholen Portugaliae Mathematica 53 (4), 397-434, 1996 | 111 | 1996 |

Concrete dualities HE Porst, W Tholen Category theory at work 18, 111-136, 1991 | 99 | 1991 |

Natural weak factorization systems M Grandis, W Tholen Archivum mathematicum 42 (4), 397-408, 2006 | 98 | 2006 |

One setting for all: metric, topology, uniformity, approach structure MM Clementino, D Hofmann, W Tholen Applied Categorical Structures 12, 127-154, 2004 | 98 | 2004 |

Closure operators II DN Dikranjan, E Giuli, W Tholen (World Scientific, Singapore, 1991), 1989 | 95 | 1989 |

Categorical Structure of Closure Operators, with Applications to Topology D Dikranjan, W Tholen Algebra and Discrete Mathematics, Kluwer Academic Publishers, Dordrecht 1, 1995 | 90 | 1995 |

Semi-topological functors I W Tholen Journal of Pure and Applied Algebra 15 (1), 53-73, 1979 | 85 | 1979 |

Beyond Barr exactness: effective descent morphisms G Janelidze, M Sobral, W Tholen Encyclopedia of Mathematics and its Applications, 359-406, 2004 | 78 | 2004 |

Weak factorization systems and topological functors J Adámek, H Herrlich, J Rosický, W Tholen Applied Categorical Structures 10, 237-249, 2002 | 78 | 2002 |

Facets of descent, II G Janelidze, W Tholen Applied Categorical Structures 5, 229-248, 1997 | 69 | 1997 |

Factorizations, localizations, and the orthogonal subcategory problem W Tholen Mathematische Nachrichten 114 (1), 63-85, 1983 | 68 | 1983 |

Categorical foundations: special topics in order, topology, algebra, and sheaf theory MC Pedicchio, W Tholen Cambridge University Press, 2004 | 64 | 2004 |

Effective descent maps of topological spaces J Reiterman, W Tholen Topology and its Applications 57 (1), 53-69, 1994 | 61 | 1994 |