F. Niyimbanira, R. Nishimwe-Niyimbanira, S. S. Kuyeli, and K. Rangaza, “The Determinants of Interest Rate Spreads in South Africa: A Cointegration Approach”, JEBS, vol. 7, no. 2(J), pp. 101–108, Apr. 2015, doi: 10.22610/jebs.v7i2(J).567.