1. I. Aberbach, and, F. Enescu, Test ideals and base change problems in tight closure theory, preprint.
2. Some results on test elements;Aberbach;Proc. Edinburgh Math. Soc. (2),1999
3. Extension of weakly and strongly F-regular rings by flat maps;Aberbach;J. Algebra,2001
4. Multiplier ideals, vanishing theorems, and applications;Ein,1997
5. A Frobenius characterization of rational singularities;Hara;Amer. J. Math.,1998