Branda Martin, Bucher M., Červinka Michal, Schwartz A. :  Convergence of a Scholtes-type regularization method for cardinality-constrained optimization problems with an application in sparse robust portfolio optimization , Computational Optimization and Applications vol.70, 2 (2018), p. 503-530 [2018] Download DOI: 10.1007/s10589-018-9985-2