Useros, F., A. Balzano, P. Prislan, M. de Luis, J. Gričar, M. Merela, and K. Čufar. “Wood Formation in Norway Spruce on a Lowland Site in Slovenia in 2015 and Comparison With Other Conifers All over Europe”. Les/Wood, Vol. 66, no. 2, Nov. 2017, pp. 15-27, doi:10.26614/les-wood.2017.v66n02a02.