Marek Galewski Joanna Smejda On the dependence on parameters for mountain pass solutions of second order discrete BVP's. 5963-5971 2013 219 Appl. Math. Comput. 11 https://doi.org/10.1016/j.amc.2012.12.028 db/journals/amc/amc219.html#GalewskiS13