1. G. Aikhorin. Personal communication 2001. G. Aikhorin. Personal communication 2001.
2. M. Arteimi. Personal communication 2002. M. Arteimi. Personal communication 2002.
3. R. Ayfer. Personal communication 2002. R. Ayfer. Personal communication 2002.
4. Surprises across the cultural divide;Barinaga M.;Science,1994
5. N. A. Bhatti. Personal communication 2001. N. A. Bhatti. Personal communication 2001.