PT - JOURNAL ARTICLE AU - Vollbrecht, Klaus TI - Tree Quality AID - 10.48044/jauf.1990.068 DP - 1990 Dec 01 TA - Arboriculture & Urban Forestry (AUF) PG - 316--318 VI - 16 IP - 12 4099 - http://auf.isa-arbor.com/content/16/12/316.short 4100 - http://auf.isa-arbor.com/content/16/12/316.full