8Mohammad Upal Mahfuz,Kazi M Ahmed.A review of micro-nanoscale wireless sensor networks for environmental protectionProspects and challenges[J].Science and Technology of Advanced Materials,2005;(6):302~306
9Levin B C, et al. Futher Development of the N-Gas Math -ematical Model [M]. Baithersburg,MD 20899 : National Institute of Standards and Technology. Chapter 20.