Y.  Sakamoto, Ogura-Tsujita, Y., Ito, K., Suetsugu, K., Yokoyama, J., Yamazaki, J., Yukawa, T., and Maki, M., ?The tiny-leaved orchid Cephalanthera subaphylla obtains most of its carbon via mycoheterotrophy?, J. Plant Res., vol. 129(6), pp. 1013 - 1020, 2016.