@article{10_21136_MB_2002_134155,
     author = {Stynes, Martin and Kellogg, R. Bruce},
     title = {$N$-widths for singularly perturbed problems},
     journal = {Mathematica Bohemica},
     pages = {343--352},
     publisher = {mathdoc},
     volume = {127},
     number = {2},
     year = {2002},
     doi = {10.21136/MB.2002.134155},
     mrnumber = {1981538},
     zbl = {1005.41009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2002.134155/}
}