Liu, Y. et al. 2015. 3-(Diphenylphosphino)propanoic Acid: An Efficient Ligand for Cu-Catalyzed N-Arylations of Indoles and Aryl Amines. Asian Journal of Chemistry. 27, 3 (Jan. 2015), 1075–1078. DOI:https://doi.org/10.14233/ajchem.2015.18258.