Gullberg, U.. (1988). Breeding of Salix as an energy crop, state of the Swedish program 1987. En: Proceedings from willow breeding symposium, Uppsala August 31 - September 1, 1987 / International Energy Agency. 1988. Solicitar como: U/5455b. páginas 7-15. https://bibliotecadigital.infor.cl/handle/20.500.12220/16161