A new national inventory for Canada: The need is now. 1996. Barker, J.; Bonnor, M.; Gilbert, D.; Omule, A.Y. The Forestry Chronicle 72(3): 276-279.
Effect of understory competition on distribution and recovery of 15N applied to a western red cedar – western hemlock clear-cut site. 1996. Chang, S.X.; Preston, C.M; McCullough, K.; Weetman, G.F.; Barker, J. Canadian Journal of Forest Research 26: 313-321.
A 10-year tree and stand response of jack pine to urea fertilization and low thinning. 1984. Groot, A.; Brown, K.M.; Morrison, I.K.; Barker, J.E. Canadian Journal of Forest Research 14: 44-50.