Krings, Michael; Kerp, Hans; Taylor, Thomas N.; Taylor, Edith L. [0204:hpvalg2.0.co;2 How Paleozoic Vines and Lianas Got off the Ground: On Scrambling and Climbing Carboniferous–Early Permian Pteridosperms]. The Botanical Review. 2003-04, 69 (2): 204–224. ISSN 0006-8101. doi:10.1663/0006-8101(2003)069[0204:hpvalg]2.0.co;2.
Krings, Michael; Kerp, Hans; Taylor, Thomas N.; Taylor, Edith L. [0204:hpvalg2.0.co;2 How Paleozoic Vines and Lianas Got off the Ground: On Scrambling and Climbing Carboniferous–Early Permian Pteridosperms]. The Botanical Review. 2003-04, 69 (2): 204–224. ISSN 0006-8101. doi:10.1663/0006-8101(2003)069[0204:hpvalg]2.0.co;2.
Krings, Michael; Kerp, Hans; Taylor, Thomas N.; Taylor, Edith L. [0204:hpvalg2.0.co;2 How Paleozoic Vines and Lianas Got off the Ground: On Scrambling and Climbing Carboniferous–Early Permian Pteridosperms]. The Botanical Review. 2003-04, 69 (2): 204–224. ISSN 0006-8101. doi:10.1663/0006-8101(2003)069[0204:hpvalg]2.0.co;2.