Kaneko A, Lu Z, Wang H, Twieg RJ, Mao G, Singer KD, Kaino T. Synthesis and characterization of NLO chromophores containing a 4-cyano-5-dicyanomethylene-2-oxo-3-pyrroline (CDCOP) acceptor group Nonlinear Optics Quantum Optics. 34: 45-48.
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https://www.oldcitypublishing.com/journals/nloqo-home/nloqo-issue-contents/nloqo-volume-34-number-1-4-2005/nloqo-34-1-4-p-45-48/