Timothy Poston (1991, 2nd ed., ISBN 978-3-540-52018-4) A First Course in Noncommutative Rings, T. Y. Lam (2001, 2nd ed., ISBN 978-0-387-95183-6) Iteration of
{\displaystyle \mathbf {F} _{1}} Vanderbilt conference on Noncommutative Geometry and Geometry over the Field with One Element (Schedule) NCG and F_un, by Alain
Boston, pp. 35–48, MR693308 Connes, Alain (1999), “Trace formula in noncommutative geometry and the zeros of the Riemann zeta function”, Selecta Mathematica
p. 17. V.G.Drinfel′d (1977-04-11), “Commutative subrings of certain noncommutative rings”, Funct Anal Its 11: 9–12, doi:10.1007/BF01135527, https://doi