Bottaro, Jeffrey C.; Penwell, Paul E.; Schmitt, Robert J. Improved synthesis of cubane-1,2,4,7-tetracarboxylic acid. The Journal of Organic Chemistry (American Chemical Society (ACS)). 1991, 56 (3): 1305–1307. ISSN 0022-3263. doi:10.1021/jo00003a071.
Bottaro, Jeffrey C.; Penwell, Paul E.; Schmitt, Robert J. Improved synthesis of cubane-1,2,4,7-tetracarboxylic acid. The Journal of Organic Chemistry (American Chemical Society (ACS)). 1991, 56 (3): 1305–1307. ISSN 0022-3263. doi:10.1021/jo00003a071.