Abdullah , D. .S, A. Rafeeq, and R. N. Butris. “Existence Uniqueness and Stability for Certain Operators of Nonlinear System of Differential Equations”. Bulletin of Social Informatics Theory and Application, vol. 7, no. 2, Dec. 2023, pp. 193-04, doi:10.31763/businta.v7i2.656.