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3. Krautkramer, J., Krautkramer, H., 1990. Ultrasonic Testing of Materials. Springer, Heidelberg, Germany
4. Maturity studies of avocado fruit based on picking dates and dry weight;Lee;J. Am. Soc. Hort. Sci.,1983
5. Mizrach, A., Flitsanov, U., 1996. Predicting avocado shelf life by an ultrasonic nondestructive method. Acta Hortic., no. 421