On the exact completion of the homotopy category
On the geometric bar construction and the Brown representability theorem
On the pullback stability of a quotient map with respect to a closure operator.
On the simplicity of some categories of closure spaces
Onto Gelfand maps : appendix
Onto Gelfand transformations
Ordinal invariants and epimorphisms in some categories of weak Hausdorff spaces
Orthogonality and closure operators
Perfect maps are exponentiable - categorically.
Precompactness and total boundedness in products of metric spaces.
Prime extensions and nearness structures
Products of locally connected locales
Products of metric, uniform and topological spaces
Pullback and pushout squares in a special double category with connection
Quantifying completion.
Raster convergence with respect to a closure operator
Realization of Cartesian Closed Topological Hulls.
Realizations of topologies and closure operators by set systems and by neighbourhoods
Reflexive cum Coreflexive Subcategories in Topology.
Regular closure operators and compactness