Stynes, Martin; Kellogg, R. Bruce: $N$-widths for singularly perturbed problems.
(English).
In:
Krbec, M.
and Kuben, J. (eds.): Proceedings of Equadiff 10, Czechoslovak International Conference on Differential Equations and Their Applications, Prague, August 27-31, 2001.
[Part 1] Invited Lectures.
Masaryk University, Brno, 2002.
pp. 197-205
