1. I. Bálint—K. Szlachányi,Finitary Galois extensions over noncommutative bases, arXiv:math.QA/0412122.
2. G. Böhm,Doi-Hopf modules over weak Hopf algebras Commun. Algebra28(10) (2000), pp. 4687–4698.
3. Lecture Notes in Pure and Appl. Math.;G. Böhm,2004
4. G. Böhm,Internal bialgebroids, entwining, structures and corings, AMS Contemp. Math.376 (2005), pp. 207–226.
5. G. Böhm,Integral theory for Hopf Algebroids, arXiv:math.QA/0403195 v3, Algebra Represent. Theory to appear.