Heller, Sascha, Leme, Elton M.C., Schulte, Katharina, Benko-Iseppon, Ana M., and Zizka, Georg (2015) Elucidating phylogenetic relationships in the Aechmea alliance: AFLP analysis of Portea and the Gravisia complex (Bromeliaceae, Bromelioideae). Systematic Botany, 40 (3). pp. 716-725.

Gitai, Jailson, Paule, Juraj, Zizka, Georg, Schulte, Katharina, and Benko-Iseppon, Ana Maria (2014) Chromosome numbers and DNA content in Bromeliaceae: additional data and critical review. Botanical Journal of the Linnean Society, 176 (3). pp. 349-368.