Nazeer, M. ‚ÄúCOMPARISON OF DIFFERENT METHODS FOR ESTIMATION OF POTENTIAL EVAPOTRANSPIRATION‚ÄĚ. The Nucleus, vol. 47, no. 1, Mar. 2010, pp. 41-46, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/909.