Al-Rammahi, A. M. H. R. (2010). NEW PROPOSED METHODS FOR CODING INFORMATION USING DIRECT PRODUCT OF SYMMETRIC MATRICES AND CONTRACTION FUNCTIONS WITH NEW PROPERTIES OF HERMITIAN MATRICES. Journal of Kufa for Mathematics and Computer, 1(1), 81-90. https://doi.org/10.31642/JoKMC/2018/010111