1. Arditti, J. and Ghani, A.K.A., Tansley Review no. 110. Numerical and physical properties of orchid seeds and their biological implications, New Phytol., 2000, vol. 145, no. 3, pp. 367–421.
2. Arditti, J., Michaud, J.D., and Healey, P.L., Morphometry of orchid seeds. 1. Paphiopedilum and native California and related species of Calypso, Cephalanthera, Corallorhiza and Epipactis, Am. J. Bot., 1979, vol. 66, no. 10, pp. 1128–1137.
3. Blinova, I., A northernmost population of Cypripedium calceolos L. (Orchidaceae): Demography, flowering, and pollination, Selbyana, 2002, vol. 23, no. 1, pp. 111–120.
4. Blinova, I.V., Populations of orchids at the northern limit of their distribution (Murmansk Oblast): Effect of climate, Russ. J. Ecol., 2008, vol. 39, pp. 26–33.
5. Blinova, I.V., The number of orchid populations and their dynamics at the northern limit of distribution in Europe, Bot. Zh., 2009, vol. 94, no. 2, pp. 212–240.