Wolfgang Notz, Fujie Tanaka, Shin-ichi Watanabe, Naidu S. Chowdari, James M. Turner, Rajeswari Thayumanavan, and Carlos F. Barbas III (2003). “The Direct Organocatalytic Asymmetric Mannich Reaction: Unmodified Aldehydes as Nucleophiles”. J. Org. Chem.68 (25): 9624-9634. doi:10.1021/jo0347359. PMID14656087.
Wolfgang Notz, Fujie Tanaka, Shin-ichi Watanabe, Naidu S. Chowdari, James M. Turner, Rajeswari Thayumanavan, and Carlos F. Barbas III (2003). “The Direct Organocatalytic Asymmetric Mannich Reaction: Unmodified Aldehydes as Nucleophiles”. J. Org. Chem.68 (25): 9624-9634. doi:10.1021/jo0347359. PMID14656087.