Essien, B. C., Idachaba, S. O., & Okai, E. E. (2019). Index of the phytoecological indicator species in the prevalent airborne pollen types in Akoko environment, Ondo State, Nigeria. GSC Biological and Pharmaceutical Sciences, 8(3), 023–041. https://doi.org/10.30574/gscbps.2019.8.3.0155