Franz Achermann and Oscar Nierstrasz, "Explicit Namespaces" pp77-89

Modular Programming Languages, Jürg Gutknecht and (2000) Modular Programming Languages, Jürg Gutknecht and Wolfgang Weck (Eds.), LNCS, vol. 1897, Springer-Verlag, Zürich, Switzerland, September 2000  

Languages mentioned Piccola1 {1999}