@article{10_1090_S0894_0347_05_00514_X,
     author = {Brenner, Holger and Katzman, Mordechai},
     title = {On the arithmetic of tight closure},
     journal = {Journal of the American Mathematical Society},
     pages = {659--672},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {2006},
     doi = {10.1090/S0894-0347-05-00514-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00514-X/}
}