@article{NSJOM_1998_28_2a_2,
     author = {Z. 

 Uzelac and K. Surla},
     title = {A 

 higher order approximation to a singular perturbation problem},
     journal = {Novi Sad Journal of Mathematics},
     pages = {19-31},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1998},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1998_28_2a_2/}
}