V.  Hartwig, Tassano, S., Mattii, A., Vanello, N., Positano, V., Santarelli, M. F., Landini, L., and Giovannetti, G., ?Computational Analysis of a Radiofrequency Knee Coil for Low-Field MRI Using FDTD?, APPLIED MAGNETIC RESONANCE, vol. 44, no. 3, pp. 389-400, 2013.