“Nitrogenase Activity, Production of Phytohormones, Siderophores and Antibiosis in Strains of Azospirillum and Klebsiella Lsolated from Maize and T Eosintle”. 2006. TERRA LATINOAMERICANA 24 (4): 493. https://terralatinoamericana.org.mx/index.php/terra/article/view/1471.