B.U., Nwaka (2018) “External and Internal Radiation Doses from Chemical Fertilisers Used in Ibadan, Oyo State, Nigeria”, Global Journal of Science Frontier Research, 18(A4), pp. 73–81. Available at: https://journalofscience.org/index.php/GJSFR/article/view/2263 (Accessed: 5 May 2024).