“Density functional theory and Ab Initio Calculations of the Heats of Formation of Pyrrole and Furan Oligomers: Progress Report”, APJSI, vol. 15, no. 2, pp. 113–128, Apr. 2024, Accessed: Mar. 16, 2026. [Online]. Available: https://journals.msuiit.edu.ph/tmf/article/view/503