H. J. Guentherodt

Force-distance studies with piezoelectric tuning forks below 4.2 K

H. J. Hug, T. Ihn, K. Ensslin, 2000, cond-mat/0005513.

Operation characteristics of piezoelectric quartz tuning forks in high magnetic fields at liquid helium temperatures

P. Schendel, P.J.A. van Schendel, H. J. Guentherodt, 1999, cond-mat/9907079.