Sammons, George D. 1-(4, 4'-Dinitrodiphenylmethyl)-Piperidines; 1-(4-Nitrobenzyl)-and 1-(4-Nitrobenzoyl)-Piperdines. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc107844/. Accessed February 27, 2015.
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