@misc{Bourass_Abdelhamid_Extremality_2003,
 author={Bourass, Abdelhamid and Ferrahi, Bouchaib and Saidou, Nourddin},
 volume={51},
 editor={Polska Akademia Nauk.},
 number={1},
 copyright={Rights Reserved - Restricted Access},
 address={Warsaw},
 howpublished={online},
 year={2003},
 publisher={Polska Akademia Nauk. Centrum Upowszechniania Nauki.},
 language={eng},
 type={Text},
 title={Extremality and differentiability of convex functions},
}