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Toque, H A., C E. Teixeira, F B M. Priviero, R P. Morganti, E. Antunes, and G. De Nucci. Vardenafil, but Not Sildenafil or Tadalafil, Has Calcium-channel Blocking Activity in Rabbit Isolated Pulmonary Artery and Human Washed Platelets. Nature Publishing Group, 2008.

Toque, H A., et al. Vardenafil, but Not Sildenafil or Tadalafil, Has Calcium-channel Blocking Activity in Rabbit Isolated Pulmonary Artery and Human Washed Platelets. Nature Publishing Group, 2008.