N.-T. Tran, H.-P. Nguyen, C.-T. Nguyen, G.-T. Truong, C.-N. Nguyen, and M. Fukuzawa, “An acoustic-mechanical sensing system with multimodal machine learning techniques for in-line quality grading of watermelons”, CTU J. of Inn. & Sus. Dev., vol. 17, no. Special issue: ISDS, pp. 1-10, Oct. 2025.