K. Enpuku, Y. Tsujita, K. Nakamura, T. Sasayama and T. Yoshida,"Biosensing utilizing magnetic markers and superconducting quantum interference devices", Supercond. Sci. Technol. 30: 053002 (2017).
http://iopscience.iop.org/article/10.1088/1361-6668/aa5fce/meta