Pregenzer, A. L.; Parmenter, R.; Passell, H. D.; Budge, T. & Vande Caste, J. Sustainability, arid grasslands and grazing: New applications for technology, article, December 8, 1999; (https://digital.library.unt.edu/ark:/67531/metadc708355/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .