Figg, Travis M.; Holland, Patrick L. & Cundari, Thomas R., 1964-. Cooperativity Between Low-Valent Iron and Potassium Promoters in Dinitrogen Fixation. [Washington, D.C.]. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc177427/. Accessed January 31, 2015.
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