Christenhusz, M. J. M., Chase, M. W., & Fay, M. F. (2011). Preface to "Linear sequence, classification, synonymy, and bibliography of vascular plants: Lycophytes, ferns, gymnosperms and angiosperms". Phytotaxa, 19(1), 4–6. https://doi.org/10.11646/phytotaxa.19.1.1