“Sustainable Integral Evaluation Model for Photovoltaic Pumping Systems in Rural Communities: El Limón and El Lagartillo”. Revista Científica Estelí, no. 21 (March 21, 2017): 64–81. Accessed August 9, 2025. https://revistas.unan.edu.ni/index.php/Cientifica/article/view/2865.