Liu, Y.S., N.N Gu, Y. Liu, X.W. Ma, P. Liu, and J.W. Xie. 2015. “3-(Diphenylphosphino)propanoic Acid: An Efficient Ligand for Cu-Catalyzed N-Arylations of Indoles and Aryl Amines”. Asian Journal of Chemistry 27 (3):1075-78. https://doi.org/10.14233/ajchem.2015.18258.