RT Journal Article SR Electronic T1 Identifying the Sophistication Levels in an IPM Philosophy JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 117 OP 119 DO 10.48044/jauf.1991.033 VO 17 IS 5 A1 Paul D. Marsan A1 Brian Hanson YR 1991 UL http://auf.isa-arbor.com/content/17/5/117.abstract AB