Alexander Schulz and  Ingrid Rottensteiner and  Manfred Neumann and  Michael Wehse and  Johann Wassermann,  Self-Sensing versus Reference Air Gaps.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2010, vol. 47(11). 1142 - 1149
    [viewed 28 January 2020]. Available from: https://publications.waset.org/pdf/1808.