Kharchenko, S.A. 2015. “A Parallel Algorithm for the Sparse $QR$ Decomposition of a Rectangular Upper Quasi-Triangular Matrix With ND-Type Sparsity”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie) 16 (46):566-77. https://doi.org/10.26089/NumMet.v16r453.