Whitelock, L.M.: The Cycads
Ďurkovič Jaroslav TUZLFF - Katedra fytológie
Biologia plantarum. Vol. 48, no. 1 (2004), p. 32, 40
xcla - ČLÁNKY
https://link.springer.com/content/pdf/10.1023%2FB%3ABIOP.0000024320.52092.32.pdf