1. On the vector-valued Hilbert transform;Defant;Math. Nachr.,1989
2. Pietsch , A. Operator ideals, Berlin 1978 and Amsterdam-New York-Oxford 1980
3. CBMS Regional Conference Series n° 60;Pisier,1980
4. Banach-Mazur distances and finite dimensional operator ideals;Tomczak-Jaegermann;Pitman monographs and surveys in pure and applied mathematics,1989