References
- Doubilet , P. , Rota , G.C. and Stanley , R.P. . On the foundations of combinatorial theory VI: The idea of a generating function . Proc. 6th Berkely Symp. on Math. Stat. and Prob . Vol. II , pp. 267 – 318 . Probability Theory
- Herstein , I.N. 1968 . “ Noncommutative rings ” . In Cams Math. Monographs , Menasha : Math. Assoc. of America .
- Rota , G.-C . 1964 . On the foundations of combinatorial theory. I Theory of Möbius functions . Z. Wahr Scheinlichkeits Theorie und Verw. Gebiete , 2 : 340 – 368 .
- Rowen , L. 1988 . Ring theory , Vol. I , Boston : Academic press .
- M , B. 1970 . Rings of quotients , New York : Springer-Verlag .