O.F., Anjorin, et al. “Estimation of Hourly Photo Synthetically- Active Radiation (PAR) From Hourly Global Solar Radiation (GSR) In Jos, Nigeria”. Asian Review of Environmental and Earth Sciences, vol. 1, no. 2, Aug. 2014, pp. 43-50, https://asianonlinejournals.com/index.php/AREES/article/view/678.