20210207010500.0 International journal of advanced research in mathematics International journal of advanced research in mathematics. http://www.scipress.com/ATMath.3 portico Portico 2016/2020 2024-03-26 Preserved : 2016: 4, 2016: 5, 2016: 6, 2016: 7, 2017: 8, 2017: 9, 2017: 10, 2018: 11, 2018: 12, 2020: 13 Preserved : 2016: 4, 2016: 5, 2016: 6, 2016: 7, 2017: 8, 2017: 9, 2017: 10, 2018: 11, 2018: 12, 2020: 13 Preserved SciPress Ltd. International Journal of Advanced Research in Mathematics 2297-6213 International journal of advanced research in mathematics. 2297-6213 Switzerland 2297-6213 2297-6213 2297-6213 International journal of advanced research in mathematics 2297-6213