Ningsih, Sri Rahayu, et al. “G-INVERS KUADRAT TERKECIL, G-INVERS NORM MINIMUM, Dan INVERS MOORE PENROSE”. Jurnal Matematika UNAND, vol. 7, no. 2, May 2018, pp. 204-11, doi:10.25077/jmu.7.2.204-211.2018.