Martínez-Zurimendi, P., J. M. Álvarez, V. Pando, M. Domínguez, J. Gordo, L. Finat, and R. Sierra-de-Grado. “Effects of Vibration on Stone Pine Trees (Pinus Pinea L.) on the Vigor of the Trees: Crown Density, Growth Shoots and Parasites of Weak Trees”. Forest Systems, Vol. 18, no. 1, Apr. 2009, pp. 50-63, doi:10.5424/fs/2009181-01050.