B. List, R. A. Lerner and C. F. Barbas III, “Proline-Catalyzed Direct Asymmetric Aldol Reactions,” Journal of the American Chemical Society, Vol. 122, No. 10, 2000, pp. 2395-2396. http://dx.doi.org/10.1021/ja994280y
 W. Notz, F. Tanaka and C. F. Barbas III, “Enamine-Based Organocatalysis with Proline and Diamines: The Development of Direct Catalytic Asymmetric Aldol, Mannich, and Diels-Alder Reactions,” Accounts of Chemical Research, Vol. 37, No. 8, 2004, pp. 580-591.
 N. Mase, Y. Nakai, N. Ohara, H. Yoda, K. Takabe, F. Tanaka and C. F. Barbas, “Organocatalytic Direct Asymmetric Aldol Reactions,” Journal of the American Chemical Society, Vol. 128, No. 3, 2006, pp. 734-735.
 A. Corma and H. Garcia, “Silica-Bound Homogenous Catalysts as Recoverable and Reusable Catalysts in Organic Synthesis,” Advanced Synthesis & Catalysis, Vol. 348, No. 12-13, 2006, pp. 1391-1412.