@article {1629, title = {Synthesis of geminal bisphosphonates via organocatalyzed enantioselective Michael additions of cyclic ketones and 4-piperidones}, journal = {Org. Biomol. Chem.}, volume = {10}, year = {2012}, pages = {404-412}, author = {A. M. Fa{\'\i}sca-Phillips and M. T. Barros} }