Maxim Zalalutdinov, Keith L. Aubin, Robert B. Reichenbach, Alan T. Zehnder, Brian Houston, Jeevak M. Parpia, and Harold G. CraigheadAppl. Phys. Lett. 83, 3815 (2003); http://dx.doi.org/10.1063/1.1622792 Pub127.pdf