1. Aldrich, J., Sherrit, S., Badescu, M., Bar-Cohen, Y., Bao, X., Chang, Z.: Controller using extremum-seeking to drive heavily perturbed electroactive actuators at resonance. In: New Technology Report (NTR), Docket No. 43519, JPL, Pasadena, CA (2006a)
2. Aldrich, J.B., Sherrit, S., Bar-Cohen, Y., Bao, X., Badescu, M., Chang. Z.: Extremum-seeking control of Ultra-sonic/Sonic Driller/Corer (USDC) driven at high-power. In: Proceedings of the SPIE Modeling, Signal Processing and Control Conference, vol. 6166, SPIE, Bellingham, WA (2006b)
3. Aldrich, J.B., Badescu, M., Jones, C., Bar-Cohen, Y.: Resonance seeking control in an event-triggered discrete-time domain. In: Proceedings of the 2008 American Control Conference (ACC), held in Seattle, Washington (2008a)
4. Aldrich, J., Bar-Cohen, Y., Sherrit, S., Badescu, M., Bao, X., Scott, J.: Percussive augmenter of rotary drills (PARoD) for operating as a Rotary-Hammer Drill. In: New Technology Report (NTR), Docket No. 46550, JPL document, Pasadena, CA (2008b)
5. Badescu, M., Sherrit, S., Olorunsola, A., Aldrich, J., Bao, X., Bar-Cohen, Y., Chang, Z., Doran, P.T., Fritsen, C.H., Kenig, F., McKay, C.P., Murray, A., Du, S., Peterson, T., Song, T.: Ultrasonic/sonic Gopher for subsurface ice and brine sampling: analysis and fabrication challenges, and testing results. In: Proceedings of the SPIE Smart Structures and Materials Symposium, Paper #6171–07, SPIE, Bellingham WA (2006a)