R. L. Thompson Truong, V. D., Hu, Z., Thompson, R. L., Yencho, G. C., & Pecota, K. V. (2012). Pressurized liquid extraction and quantification of anthocyanins in purple-fleshed sweet potato genotypes. JOURNAL OF FOOD COMPOSITION AND ANALYSIS, 26(1-2), 96–103. https://doi.org/10.1016/j.jfca.2012.03.006 THOMPSON, R. L., FLEMING, H. P., HAMANN, D. D., & MONROE, R. J. (1982). METHOD FOR DETERMINATION OF FIRMNESS IN CUCUMBER SLICES. JOURNAL OF TEXTURE STUDIES, 13(3), 311–324. https://doi.org/10.1111/j.1745-4603.1982.tb00886.x