Stoppani, A.O.M.; Fuller, R.C. & Calvin, M. Carbon Dioxide Fixation by Rhodopseudomonas Capsulatus, report, October 6, 1954; (https://digital.library.unt.edu/ark:/67531/metadc889696/m1/1/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .