Holst , MichaelLi , YuwenMihalik , Adam and Szypowski , Ryan. (2020). Convergence and Optimality of Adaptive Mixed Methods for Poisson's Equation in the FEEC Framework.
            <i>Journal of Computational Mathematics</i>. <i>38</i> (5).
            748-767.
         doi:10.4208/jcm.1905-m2018-0265