Some type of rotational scheme. Faried, Nashat, Abd El-Kader, Zeinab (2002) International Journal of Mathematics and Mathematical Sciences
Stable Convex Sets and Extremal Operators. A. Clausing, S. Papadopoulous (1977) Mathematische Annalen
Sur les opérateurs multiplicativement liés Jean G. Dhombres (1971) Mémoires de la Société Mathématique de France
Symmetric subspaces of l 1 with large projection constants Bruce Chalmers, Grzegorz Lewicki (1999) Studia Mathematica We construct k-dimensional (k ≥ 3) subspaces V k of l 1 , with a very simple structure and with projection constant satisfying λ ( V k ) ≥ λ ( V k , l 1 ) > λ ( l 2 ( k ) ) .
Symmetric subspaces related to certain eigenvalue problems A. Dijksma, H. S. V. de Snoo (1973) Compositio Mathematica