@article{article7a113229, title = {Magnetic Susceptibility Measurements at Ultra-low Temperatures}, author = {Yin, L and Xia, J S and Sullivan, N S and Zapf, V S and Paduan-Filho, Armando}, year = {2009}, doi = {10.1007/s10909-009-0029-2}, journal = {Journal of Low Temperature Physics} }