A Study on Fuzzy Diagnostic Method of Mineral Nutrient Elements in the Leaves of Deciduous Fruit Tree
Duan Zemin, Wang Xianping, Niu Zimian
ACTA AGRICULTURAE BOREALI-SINICA . 1994, (1): 68 -74 .  DOI: 10.3321/j.issn:1000-7091.1994.01.014