WASET
Hellam, S. , Oulahrir, Y. , Mounchid, F. , Sadiq, A. , Mbarki, S.. "3D Objects Indexing with a Direct and Analytical Method for Calculating the Spherical Harmonics Coefficients". World Academy of Science, Engineering and Technology, Open Science Index 98, International Journal of Computer and Information Engineering, (2015), 9(2), 613 - 623.