<i>Hypericum Perforatum</i> L., <i>H. Maculatum</i> Crantz., <i>H. Calycinum</i> L. and <i>H. pulchrum</i> L.: Phytochemical and Morphological StudiesGelsomina Fico, Franca Tomé, N. Colombo et al.|Natural Product Communications|2006Cited by 6