1. Positive linear maps on C∗-algebras;Choi,1972
2. Choi, M.D.: Completely positive linear maps on complex matrices, Linear Algebra and Appl. (to appear).
3. Choi, M.D.: Positive semidefinite biquadratic forms, preprint.
4. Eléments d'analyse;Dieudonné,1969
5. Gorini, V., A. Kossakowski, E.C.G. Sudarshan: Completely positive dynamical semigroups of N-level systems, The University of Texas at Austin, Preprint ORO-3992-200, CPT 244.