1. Onnes, H.K.: VII. The potential difference necessary for the electric current through mercury below 4°19 K, Leiden Comm. 133a (22 Feb. 1913); V III. The sudden disappearance of the ordinary resistance of tin and the super-conductive state of lead, ibid., 133d (1913)
2. Onnes, H.K.: Further experiments with liquid helium, I,….IX, The appearance of galvanic resistance in supra-conductors which are brought into a magnetic field at a threshold value of the field, Leiden Comm. 139f (28 Feb. 1914 )
3. Gajda, D., Zaleski, A.J., Morawski, A.J., Haßler, W., Nenkov, K., Rindfleisch, M.A., Hossain, M.S.A.: Pinning mechanism and engineering critical current density considerations in the design of MgB2 superconducting coils. Physica C. 570, 1353606 (2020)
4. Sumption, M.D., Bhatia, M., Rindfleisch, M., Tomsic, M., Collings, E.W.: Transport and magnetic Jc of MgB2 strands and small helical coils. Appl. Phys. Lett. 86, 102501 (2005)
5. Patel, D., Qiu, W., Mustapić, M., Knott, J.C., Ma, Z., Gajda, D., Shahabuddin, M., Xu, J., Choi, S., Tomsic, M., Dou, S.X., Yamauchi, Y., Kim, J.H., Hossain, M.S.A.: Evaluation of a solid nitrogen impregnated MgB2 racetrack coil. Supercond. Sci. Technol. 31, 105010 (2018)