Đurin, B., and L. Baić. “The Method of Selecting the Optimal Variant of Irrigation Systems Driven by PV Energy”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 26, no. 3, Nov. 2016, pp. 225-43, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2324.