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    Wu, A.-J., Tseng, P.-Y., Hsu, W.-H., & Chuang, S.-C. (2015). Tricyclohexylphosphine-Catalyzed Cycloaddition of Enynoates with [60]Fullerene and the Application of Cyclopentenofullerenes as n-Type Materials in Organic Photovoltaics. Organic Letters, 18(2), 224–227. doi:10.1021/acs.orglett.5b03293 
    10.1021/acs.orglett.5b03293