1. Mathematics Department, Mathematics and Natural Science Faculty, Universitas Sriwijaya, Indralaya, Indonesia
2. Computer Engineering Department, Computer Science Faculty, Universitas Sriwijaya, Indralaya, Indonesia
3. Computation Laboratory, Mathematics and Natural Science Faculty, Universitas Sriwijaya, Indralaya, Indonesia
4. Informatics Engineering Department, Politeknik Negeri Lhokseumawe, Lhokseumawe, Indonesia
5. Computer Systems Department, Institut Sains dan Teknologi Akprind, Yogyakarta, Indonesia