Gagen, M., Levanič, T., Gričar, J., Jalkanen, R., Loader, N., McCarroll, D., . . . Robertson, I. (2009). The climate sensitivity of Norway spruce [Picea abies (L.) Karst.] in the southeastern European Alps. Trees, 23(1), pp. 169-180. doi:10.1007/s00468-008-0265-0

Gagen, Mary, Tom Levanič, Jožica Gričar, Risto Jalkanen, Neil Loader, Danny McCarroll, Primož Oven, and Iain Robertson. "The Climate Sensitivity of Norway Spruce [Picea Abies (L.) Karst.] in the Southeastern European Alps." Trees 23, no. 1 (2009): 169-180.

Gagen, Mary, et al. "The Climate Sensitivity of Norway Spruce [Picea Abies (L.) Karst.] in the Southeastern European Alps." Trees 23.1 (2009): 169-180.