Yamashita S, Mase N, Takabe K (2008-09-22). "Chemoenzymatic total synthesis and determination of the absolute configuration of (S)-nebracetam". Tetrahedron: Asymmetry. 19 (18): 2115–2118. doi:10.1016/j.tetasy.2008.09.004. ISSN0957-4166.
Yamashita S, Mase N, Takabe K (2008-09-22). "Chemoenzymatic total synthesis and determination of the absolute configuration of (S)-nebracetam". Tetrahedron: Asymmetry. 19 (18): 2115–2118. doi:10.1016/j.tetasy.2008.09.004. ISSN0957-4166.