1. A. B. Ghorbal, Fondements Algébriques des Probabilités Quantiques et Calcul Stochastique Sur L'espace de Fock Booléen, PhD thesis, Université Henri Poincaré-Nancy 1, 2001.
2. A. B. Ghorbal, M. Schürmann, On the Algebraic Foundations of Non-Commutative Probability Theory, Ernst-Moritz-Arndt-Univ., 1999.
3. B. Stenström, Rings of Quotients: An Introduction to Methods of Ring Theory, 217, Springer Science & Business Media, 2012.
4. N. Muraki, Classification of Universal Notions of Stochastic Independence. Surikaisekikenkyusho Kokyuroku, 1278, (2002), 123-129.
5. THE FIVE INDEPENDENCES AS QUASI-UNIVERSAL PRODUCTS