Manik, N. I., and D. Tasman. “Piranti Lunak Pengujian Struktur Matematika Grup, Ring, Field Berbasis Osp (Open Source Program)”. ComTech: Computer, Mathematics and Engineering Applications, vol. 5, no. 1, June 2014, pp. 373-86, doi:10.21512/comtech.v5i1.2631.