1. Programma van Jaarlijkse Prijsvragen (Annual Problem Section);Nieuw Arch. Wiskund.,1968
2. Positive Operators;Aliprantis,1985
3. Interpolation of Operators;Bennett,1988
4. Factorizing the classical inequalities;Bennett;Mem. Amer. Math. Soc.,1996
5. About some parameters of normed linear spaces;Casini;Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur.,1986