6VALERYN Filippov, ANDREIN Starodumov. The Role of Photoconductive Effect in Operation of Bi12 tio20 --Based Optical Voltage Sensor[J]. Optical and Quantum Electronics, 2002, 34 : 86 7- 875.
7Y. W. Yang. Monitoring of rocks using smart sensors [ J ]. Tunnelling and Underground Space Technology, 2007,2 (22) :206-221.
8Dean M. Aslam, Girish D. Dangi. Design, fabrication and testing of a smart robotic foot [ J ]. Robotics and Autonomous Systems ,2005,2( 55 ) :207 - 214.