Jakubska, Anna, et al. “New Data on the Apophytic Occurrence of Epipactis Helleborine (L.) Crantz and Cephalanthera Longifolia (L.) Fritsch in Populus X Canadensis Plantation in Lower Silesia (south-Western Poland)”. Biodiversity: Research and Conservation, no. 1-2, June 2006, pp. 95-97, doi:10.14746/biorc.2006.1-2.21.