Martínez-Nieto, Patricia, and Cielo Orozco-Jaramillo. 2009. “Evaluation of Inoculation With Asymbiotic Nitrogen-Fixing Microorganisms Isolated from Rhizosphere of Pinus Patula in Colombia”. Revista Bosque 30 (2):70-77. https://revistabosque.org/index.php/bosque/article/view/832.