G. Sonne, M.E. Peña-Aza, R. I. Shekhter, L.Y. Gorelik, and M. Jonson, Voltage-driven superconducting weak link as a refrigerator for cooling of nanomechanical vibrations, Low Temp. Phys. 36, (2010) [Fiz. Nizk. Temp. 36, 1128-1137, (2010)] DOI: https://doi.org/10.1063/1.3515521.