(en) Carlquist, S. & E.L. Schneider (2002). The tracheid–vessel element transition in angiosperms involves multiple independent features: cladistic consequences. American Journal of Botany89 (2): 185–195. PMID21669726. DOI: 10.3732/ajb.89.2.185.
(en) Carlquist, S. & E.L. Schneider (2002). The tracheid–vessel element transition in angiosperms involves multiple independent features: cladistic consequences. American Journal of Botany89 (2): 185–195. PMID21669726. DOI: 10.3732/ajb.89.2.185.