LYVANAN. ESTABLISH AN ADDITIVE (s;t)-FUNCTION IN EQUALITIES BY FIXED POINT METHOD AND DIRECT METHOD WITH n-VARIABLES IN BANACH SPACE. m [Internet]. 2023Jan.7 [cited 2024Dec.3];9(1):1-13. Available from: http://467182.nmy9asj5x.asia/index.php/m/article/view/5515