A. Guyan Robertson

On the spectrum of the sum of generators for a finitely generated group

Alain Valette, Pierre de la Harpe, A. Guyan Robertson, 1993 .

Positive extensions of automorphisms of spin factors

A. Robertson, A. Guyan Robertson, 1983, Proceedings of the Royal Society of Edinburgh: Section A Mathematics.

Schwarz inequalities and the decomposition of positive maps on C *-algebras

A. Guyan Robertson, 1983 .