J. A., Akinpelu, and Obioh I. B. 2017. “Validation of Global Solar Radiation (GSR) Data Using Artificial Neural Networks (ANN) for Estimation of GSR in Nigeria for Solar Energy Applications”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 36 (8):303-12. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7130.