Vellem, V. and Matezo Espoir, L. (2021) “The impact of aid for trade on horizontal and vertical export diversification: The case of Sub-Saharan Africa and Developing Asia”, International Journal of Research in Business and Social Science (2147- 4478), 10(5), pp. 135–147. doi: 10.20525/ijrbs.v10i5.1296.