Authors
Mohammed Sahmoudi
LAGA Laboratory Faculty of Sciences Dhar El Mahraz P. 0. Box 1796,, Atlas-Fez, MOROCCO
Abdelhakim Chillali
abdelhakim.chillali@usmba.ac.ma
Sidi Mohamed Ben Abdellah University FP, LSI,, Taza, MOROCCO
abdelhakim.chillali@usmba.ac.ma
© 2018 Mohammed Sahmoudi, Abdelhakim Chillali, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.