Tsvetkov, I., Benelli, C., Capuana, M., De Carlo, A. and Lambardi, M. 2009. Application of vitrification-derived cryotechniques for long-term storage of poplar and aspen (Populus spp.) germplasm. Agricultural and Food Science. 18, 2 (Jan. 2009), 160–166. DOI:https://doi.org/10.2137/145960609789267515.