R. Joshi, Rekha, et al. “Ammonium Chloride Promoted One-Pot, Three-Component Mannich Reaction: An Efficient Synthesis of β-Amino Ketones and Β-Amino Esters”. Asian Journal of Chemistry, vol. 34, no. 12, Nov. 2022, pp. 3353-60, doi:10.14233/ajchem.2022.23978.