Title: Properties of twisted semigroup rings
Description: <a href="http://uf.catalog.fcla.edu/uf.jsp?st=UF022771070&ix=pm&I=0&V=D&pm=1" rel="nofollow">http://uf.catalog.fcla.edu/uf.jsp?st=UF022771070&ix=pm&I=0&V=D&pm=1</a>
Subjects: Semigroups, Rings (Algebra, Group rings, Associative rings.