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Ishii, Kazuyuki; Kobayashi, Nagao; Matsuo, Tsukasa; Tanaka, Masanobu; Sekiguchi, Akira (2001). “Observation of the Predicted Negative Faraday A MCD Term in a Cyclobutadiene Dianion”. J. Am. Chem. Soc.123 (22): 5356–5357. doi:10.1021/ja004285r. PMID11457402.
