An Algebraic Semantics of Subobjects. - Jonathan G. Rossie Jr.; Daniel P. Friedman (OOPSLA, 1995)

Modeling Subobject-based Inheritance. - Jonathan G. Rossie Jr.; Daniel P. Friedman; Mitchell Wand (ECOOP, 1996)

Logical Observable Entities. - Jonathan G. Rossie Jr. (OOPSLA, 1998)