MARWAN, M., EKARIANI, S., & HARIPAMYU, H. (2021). TEOREMA TITIK TETAP DI RUANG NORM-2 (R n, k., .k2). Jurnal Matematika UNAND, 10(1), 116–128. https://doi.org/10.25077/jmu.10.1.116-128.2021