X. W. Zhang, X. D. Zhang, H. Mao, H. Y. Gao, Z. Y. Zuo, and Y. Q. Ruan, “Research on Tomato Nitrogen Content Nondestructive Testing Method Based on Multidimensional Image Processing Technology: nondestructive testing of tomato nitrogen content”, JAA, vol. 8, no. 1, pp. 1374–1383, Mar. 2018.