- Phys. Rev. B 57(12):6884--6895 (March 1998)
- Journal of Alloys and Compounds 360(1-2):41--46 (October 2003)
- Phys. Rev. B 66(13):134435--7 (October 2002)
- Phys. Rev. B 67(21):214402--11 (June 2003)
- Phys. Rev. B 68(22):224432--11 (December 2003)
- Phys. Rev. B 72(11):115106--8 (September 2005)


user