Property (T) for ... Factors and unitary representations of Kazhdan groups. A. Guvan Robertson — 1993 Mathematische Annalen
A Korovkin Theorem for Schwarz Maps on C*-Algebras. A. Guyan Robertson — 1977 Mathematische Zeitschrift
On the spectrum of the sum of generators of a finitely generated group, II Pierre de la Harpe; A. Robertson; Alain Valette — 1993 Colloquium Mathematicae
Convenient categories for topologists H. L. Bentley; Horst Herrlich; W. A. Robertson — 1976 Commentationes Mathematicae Universitatis Carolinae