A. Aberqi, J. Bennouna and H. Redwane. (2017). Entropy Unilateral Solution for Some Noncoercive Nonlinear Parabolic Problems via a Sequence of Penalized Equations.
            <i>Analysis in Theory and Applications</i>. <i>33</i> (1).
            29-45.
         doi:10.4208/ata.2017.v33.n1.4