NASSIRI, Seyed Mehdi; SINGH, Surendra. Optimization of Energy Inputs for Wheat Cultivation in Punjab Using Data Envelopment Analysis Technique. Journal of Agricultural Engineering, India, v. 45, n. 3, 2008. Disponível em: https://epubs.icar.org.in/index.php/JAE/article/view/14534. Acesso em: 6 jun. 2026.