Authors
A. D. Yanchuk
Research Branch, British Columbia Ministry of Forests, 1st Floor, 722 Johnson Street,, Victoria, Canada
J. Bishir
North Carolina State University, Department of Mathematics, Raleigh, North, Carolina, USA
J. H. Russell
Research Branch, British Columbia Ministry of Forests, Cowichan Lake Research Station, 7060 Forestry Road,, Mesachie Lake, Canada
K. R. Polsson
Research Branch, British Columbia Ministry of Forests, 1st Floor, 722 Johnson Street,, Victoria, Canada