Quercus suber network: Report of the 3rd and 4th meetings, 9-12 June 1996, Sassari, Sardinia, Italy, 20-22 February 1997, Almoraima, Spain. n. 85 p. ISBN: 978-92-9043-336-1, ISBN: 92-9043-336-1
European Forest Genetic Resources Programme; Turok, J.; Varela, M.C.; Hansen, C. (comps.)