Bandy, S., and W. Wan Zainal. “A General Solar Radiation Estimation Model Using Ground Measured Meteorological Data in Sarawak, Malaysia”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1, Jan. 2018, pp. 99-105, https://jtec.utem.edu.my/jtec/article/view/1912.