D. D.-L.-V. Djimbi Makoundi and L. . Zhang, “Investigation on Syngas production from forest Biomass (Sapele, Sypo and Ayous) wood in the downdraft gasifier using Aspen plus and IC engine integration”, J. Ren. Energies, vol. 27, no. 2, pp. 339 – 358, Dec. 2024, doi: 10.54966/jreen.v27i2.1308.