References
- Findlay , G. D. and Lambek , J. 1958 . A generalized ring of quotients . Can. Math. Bull. , 1 : 77 – 85 . 155–167
- Lambek , J. 1963 . On Utumi's ring of quotients . Can. J. Math , 15 : 363 – 370 .
- Rowen , L. H. 1988 . Ring Theory Vol. I , Academic Press, Inc. .
- Spiegel , E. 2000 . Essential ideals of incidence algebras . J. Austral. Math. Soc. (Series A) , 68 : 252 – 260 .
- Spiegel , E. and O'Donnell , C. J. 1997 . Incidence Algebras Marcel Dekker, Inc. .
- Stenström , B. 1970 . Rings of Quotients New York : Springer-Verlag .