WASET
Hellam, S. , Oulahrir, Y. , Mounchid, F. , Sadiq, A. , Mbarki, S. (2015), '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, 9(2), 613 - 623.