Effect of <em> &gamma; </em> radiation on the low temperature acoustic behavior of a-SiO<sub>2</sub>

E. Nazaretski, R. D. Merithew, V. O. Kostroun, A. T. Zehnder, R. O. Pohl, and J. M. Parpia

Phys. Rev. Lett., 92, 245502-1-4, (2004).