1. L. Aagaard, A Banach algebra approach to amalgamated R- and S-transforms, 2004, preprint.
2. Topics in functional calculus;Graves;Bull. Amer. Math. Soc.,1935
3. U. Haagerup, On Voiculescu's R- and S-transforms for free non-commuting random variables, in: D. Voiculescu (Ed.), Free Probability Theory, Fields Institute Communications, vol. 12, 1997, pp. 127–148.
4. Implicit functions and their differentials in general analysis;Hildebrandt;Trans. Amer. Math. Soc.,1927
5. Functional Analysis and Semi-Groups;Hille,1957