Nicolas Crouseilles, Michel Mehrenberger and Hocine Sellama. (2010). Numerical Solution of the Gyroaverage Operator for the Finite Gyroradius Guiding-Center Model.
            <i>Communications in Computational Physics</i>. <i>8</i> (3).
            484-510.
         doi:10.4208/cicp.010909.220110a