Needle trace method and crown thinning (defoliation) in pines. Final report. EU-project 97.60.SF.005.0. Finnish Forest Research Institute, Rovaniemi Research Station, and University of Turku, Satakunta Environment Research Center, Pori - Jalkanen, R.; Aalto, T.; Ojanen, M.; Vainio, E. (FI, 2000)
Keywords: NTM; mänty