Shi, Z. P., Liu, Z. K., Guan, Y., Ye, S. W., Zhang, J., & Wei, H. X. (2014). Formalization of Function Matrix Theory in HOL. Journal of Applied Mathematics, 2014(), 199-208-117. https://doi.org/10.1155/2014/201214
Cichocki, A., Mørup, M., Smaragdis, P., Wang, W., & Zdunek, R. (2008). Advances in Nonnegative Matrix and Tensor Factorization. Computational Intelligence and Neuroscience, 2008(), 104-106. https://doi.org/10.1155/2008/852187