S. P.  Kotkar, Chavan, V. B., and Sudalai, A., ?Organocatalytic sequential alpha-amination-horner-wadsworth-emmons olefination of aldehydes: enantioselective synthesis of gamma-amino-alpha,beta-unsaturated esters?, Organic Letters, vol. 9, no. 6, pp. 1001-1004, 2007.