@article{escidoc:0466, title = {{Planar high-Tc superconducting quantum interference device gradiometer for simultaneous measurements of two magnetic field gradients}}, author = {Steppke, A. and Becker, C. and Grosse, V. and D\"orrer, L. and Schmidl, F. and Seidel, P. and Djupmyr, M. and Albrecht, J.}, journal = {{Applied Physics Letters}}, volume = {92}, year = {2008}, doi = {10.1063/1.2903696} }