Zhang, H.; Semenza, G. L. (2009). “Reply to Lopez-Lazaro: Evidence that digoxin inhibits human cancer”. Proceedings of the National Academy of Sciences106 (9): E27. Bibcode: 2009PNAS..106...27Z. doi:10.1073/pnas.0900125106.
Zhang, H.; Semenza, G. L. (2009). “Reply to Lopez-Lazaro: Evidence that digoxin inhibits human cancer”. Proceedings of the National Academy of Sciences106 (9): E27. Bibcode: 2009PNAS..106...27Z. doi:10.1073/pnas.0900125106.