Aziz TL. Problems of Combining Absolute and Relative Points and Area Symbols, With Special Reference to Mapping Industrial Workers in North and West Sumatera, Indonesia. J. Math. Fund. Sci. [Internet]. 2019Jan.30 [cited 2025Sep.10];18(1):1-11. Available from: https://journals.itb.ac.id/index.php/jmfs/article/view/9523