1. Butson, C., and King, D. J.: 1999, Semivariance analysis of forest structure and remote sensing data to determine an optimal sample plot size, In: Proc. 4th Int. Airborne Rem. Sens. Conf., Ottawa, Ontario, 21–24/06, Env. Res. Inst. of Michigan, Ann Arbor. Vol. II, pp. 155--162.
2. Canadian Council of Forest Ministers: 1995, Defining sustainable forest management: a Canadian approach to Criteria and Indicators, Can. For. Serv. Pub. Fo-75-3/4-1995, Ottawa, Canada.