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3. Beets, P.N., Oliver, G.R., 1998. Field Guide to Scoring Upper Mid-crown Yellowing (UMCY) Symptoms in Radiata Pine. New Zealand Forest Research Institute Ltd., Bulletin No. 208.
4. Upper mid-crown yellowing (UMCY) in Pinus radiata forests;Beets;NZ For.,1993
5. Genotypic variation in symptoms of upper mid-crown yellowing and Cyclaneusma minus in a Pinus radiata stand;Beets;NZ J. For. Sci.,1997