Magrini, Sara, and Anna Scoppola. “Variability of Pollen Aperture Heteromorphism in Annual Pansies (Viola Section Melanium)”. Acta Botanica Croatica 74, no. 1 (April 1, 2015). Accessed April 27, 2024. https://www.abc.botanic.hr/index.php/abc/article/view/1065.