STRAW, N.A. - ARMOUR, H.L. - DAY, K. R. The financial costs of defoliation of Scots pine (Pinus sylvestris) by pine looper moth (Bupalus piniaria). In Forestry. - Oxford University Press : Oxford. ISSN 0015-752X, 2002, vol. 75, no. 5, s. 525-536.