@article{NSJOM_1982_12_Nonea_16,
     author = {Surla Katarina},
     title = {On the convergence of some 

 finite difference schemes for a singular perturbation problem},
     journal = {Novi Sad Journal of Mathematics},
     pages = {191-203},
     publisher = {mathdoc},
     volume = {12},
     year = {1982},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1982_12_Nonea_16/}
}