books.google.com - Integral closure has played a role in number theory and algebraic geometry since the nineteenth century, but a modern formulation of the concept for ideals perhaps began with the work of Krull and Zariski in the 1930s. It has developed into a tool for the analysis of many algebraic and geometric problems....http://books.google.com/books/about/Integral_Closure_of_Ideals_Rings_and_Mod.html?id=APPtnn84FMIC&utm_source=gb-gplus-shareIntegral Closure of Ideals, Rings, and Modules
