Regular closure operators. - Gabriele Castellini; Jürgen Koslowski; George E. Strecker (Appl. Categorical Struct., 1994)

Closure operators and fuzzy connectedness. - Ian W. Alderton; Gabriele Castellini (Fuzzy Sets Syst., 1999)

Connectedness with Respect to a Closure Operator. - Gabriele Castellini (Appl. Categorical Struct., 2001)

Closure Operators with Respect to a Functor. - Gabriele Castellini; Eraldo Giuli (Appl. Categorical Struct., 2001)

A Link Between Two Connectedness Notions. - Gabriele Castellini; David B. Holgate (Appl. Categorical Struct., 2003)

U-Closure Operators and Compactness. - Gabriele Castellini; Eraldo Giuli (Appl. Categorical Struct., 2005)

Interior Operators, Open Morphisms and the Preservation Property. - Gabriele Castellini (Appl. Categorical Struct., 2015)

A Diagram of Galois Connections of Functorial Topologies. - Gabriele Castellini; Stan Dziobiak (Appl. Categorical Struct., 2016)