Slobodan Babic and Cevdet Akyel, “New Formulas for the Mutual Inductance and the Magnetic Force of the System: Thin Disk Coil (Pancake) with Inverse Radial Current Density and Thin Wall Solenoid with Constant Azimuthal Current Density”, GJRE, vol. 18, no. F4, pp. 11–16, Jul. 2018.