* [https://www.journals.uchicago.edu/doi/abs/10.1086/377063 Ronse De Craene LP, Soltis PS, Soltis DE. 2003. Evolution of floral structures in basal angiosperms. International Journal of Plant Sciences 164] | * [https://www.journals.uchicago.edu/doi/abs/10.1086/377063 Ronse De Craene LP, Soltis PS, Soltis DE. 2003. Evolution of floral structures in basal angiosperms. International Journal of Plant Sciences 164] |