@inbook{inbook77b61525,
title   = {Use of diagnosis recommendation integrated system (DRIS) evaluate the nutritional status of healthy and blight affected citrus trees},
author = {Malavolta, E. and Oliveira, S. A. and Vitti, G C},
year = {1993},
publisher = {Kluwer Academic},
journal   = {Optimization of Plant Nutrition}
}