7Natasha H, Nabeel Y, Terry V. Minimal-impact Seismic Acquisition: Successful Imaging Using an Accelerated Weight Drop System[CT//71st EAGE Conference Exhibition Incorporating SPE EUR- OPEC, Section 3. Amsterdam, 2009 : S007-1.
8Sallas J J.Seismic Vibrator Control and the Downgo- ing P-wave[J]. Geophysics, 1984,49(6) :732-740.
9Lebedev A V, Beresnev I A, Vermeer P L. Model Parameters of the Nonlinear Stiffness of the Vibra- tor-ground Contact Determined by Inversion of Vi- brator Accelerometer Data[J]. Geophysics, 2006, 71(3) : H25-H32.
