5Mcglone V A, Jordan R B. Kiwi fruit and apricot firmness measurement by the non-contact laser air-puff method [J] . Postharvest Biology and Technology, 2000, 19 (1) : 47- 54.
6Tu K, Jancsok P, Nicolai B, et al. Study of apple fruit quality based on the analysis of laser scattering image [J] . International Agrophysics, 2000, 14 (1): 141-147.