1. Triangularizing semigroup of compact operators;Nordgren;Indiana Univ. Math. J.,1984
2. On the reduction and triangularization of semigroups of operators;Radjavi;J. Oper. Theory,1985
3. A trace condition equivalent to simultaneous triangularizability;Radjavi;Canad. J. Math.,1986
4. On reducibility of semigroups of compact operators;Radjavi;Indiana Univ. Math. J.,1990
5. Spectral conditions and reducibility of operator semigroups;Lambrou;Indiana Univ. Math. J.,1992