- Anyanwu, Timothy., Ekpo, Bassey., Oriji, Boniface. (2024) Biomarker application in the recognition of the geochemical characteristics of crude oils from the five depobelts of the Niger Delta basin, Nigeria. Iranian Journal of Earth Sciences, 14(1), 1-17. https://doi.org/10.30495/ijes.2022.1943029.1664