Ilqar Ramazanli,  Matrix Completion with Heterogeneous Observation Cost Using Sparsity-Number of Column-Space.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2022, vol. 186(6). 32 - 37
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10012575.