Barger, P. T.; Spehlmann, B. C. & Gajda, G. J. Development of a catalyst for conversion of syngas-derived materials to isobutylene, report, October 1, 1996; (https://digital.library.unt.edu/ark:/67531/metadc691797/m1/1/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .