An efficient regularization method for a large scale ill-posed geothermal problem. - Fredrik Berntsson; Chen Lin; Tao Xu; Dennis Wokiyi (Comput. Geosci., 2017)

Solvability of a non-linear Cauchy problem for an elliptic equation. - Fredrik Berntsson; Vladimir A. Kozlov; Dennis Wokiyi (Int. J. Comput. Math., 2019)