1. Albert V. A. 1994. Cladistic relationships of the slipper orchids ( Cypripedioideae: Orchidaceae) from congruent morphological and molecular data. Lindleyana 9: 115–132.
2. Albert V. A., Chase M. W. and Coleman A. W. 1990. Molecular phylogenetics of the slipper orchids (Cypripedioideae): Evolution of an intergenic ‘floral complex’. In D. G. Bonham and J. Kemohan (eds.) Proc. 13th World Orchid Conf. 1990. 13 WOC Proceedings Trust, Auckland, p. 289–290.
3. Alvarez M. R. 1968. Quantitative changes in nuclear DNA accompanying postgermination embryonic development in Vanda (Orchidaceae). Am. J. Bot. 1036: 1036–1041.
4. Alvarez M. R. 1969. Cytophotometric study of nuclear proteins and nucleic acids in parenchymatous tissue of the orchid embryo. Exp. Cell Res. 57: 179–184.
5. Alvarez M. R. 1970. Microfluorometric comparison of feulgen-deoxyribonucleic acid hydrolysis in meristematic and differentiated cells of the orchid embryo. Exp. Cell Res. 61: 191–198.