Primitive iteration and unary functions. - G. M. Germano; Stefano Mazzanti (Ann. Pure Appl. Log., 1988)

Non-Deterministic Closure Theory and Universal Arrows. - G. M. Germano; Stefano Mazzanti (Appl. Categorical Struct., 2001)

Cantor Diagrams: A Unifying Discussion of Self-Reference. - G. M. Germano; Stefano Mazzanti (Appl. Categorical Struct., 2003)