P. Schöffel and M. H. Müser,
Elastic constants of quantum solids by path integral simulations,
Phys. Rev. B 63, 224108 (2001); cond-mat/0009379 .
P. Schöffel and M. H. Müser,
Elastic constants of quantum solids by path integral simulations,
Phys. Rev. B 63, 224108 (2001); cond-mat/0009379 .