[7] Bravo C, Moshou D, West J, et al. Biosystems Engineering, 2003, 84(2): 137.
[8] Cui D, Zhang Q, Li M Z, et al. Sensing and Instrumentation for Food Quality and Safety, 2009, 3: 49.
[9] Kim M S, Chen Y R, Meh P M. Transactions of the ASAE, 2001, 44 (3) : 721.