Geary, R. (1962). Relative Efficiency of the Split-Matrix Method for Matrix Inversion and for the Solution of Linear Simultaneous Equations, Memorandum Series 1, Dublin: ESRI, https://www.esri.ie/publications/relative-efficiency-of-the-split-matrix-method-for-matrix-inversion-and-for-the-solution-of-linear-simultaneous-equations