Cu-Al Hydrotalcite: An Efficient and Reusable Ligand-Free Catalyst for the Coupling of Aryl Chlorides with Aliphatic, Aromatic, and N(H)-Heterocyclic Amines - Sreedhar, B.; Arundhathi, R.; Reddy, P. Linga; Reddy, M. Amarnath; Kantam, M. Lakshmi (Synthesis, 2009)