Rouchaud, J., Moons, C., & Meyer, JA. (1983). Effects of Selected Fungicide Treatments On the Sugar Content of Golden Delicious and Jonagold Apples. Scientia Horticulturae, 20(2), 161-168. https://doi.org/10.1016/0304-4238(83)90136-X (Original work published 1983)