K. Andrew Cliffe, Edward J. C. Hall, Paul Houston, Eric T. Phipps & Andrew G. Salinger. (2020). Adaptivity and a Posteriori Error Control for Bifurcation Problems I: The Bratu Problem.
            <i>Communications in Computational Physics</i>. <i>8</i> (4).
            845-865.
         doi:10.4208/cicp.290709.120210a