Law, Edward W.; Prasad, Abhnil A.; Kay, Merlinde; Taylor, Robert A. «Direct normal irradiance forecasting and its application to concentrated solar thermal output forecasting – A review». Solar Energy, 108, 01-10-2014, pàg. 287–307. Bibcode: 2014SoEn..108..287L. DOI: 10.1016/j.solener.2014.07.008.
Law, Edward W.; Prasad, Abhnil A.; Kay, Merlinde; Taylor, Robert A. «Direct normal irradiance forecasting and its application to concentrated solar thermal output forecasting – A review». Solar Energy, 108, 01-10-2014, pàg. 287–307. Bibcode: 2014SoEn..108..287L. DOI: 10.1016/j.solener.2014.07.008.