R. Vulanovic et Pa. Farrell, CONTINUOUS AND NUMERICAL-ANALYSIS OF A MULTIPLE BOUNDARY TURNING-POINT PROBLEM, SIAM journal on numerical analysis, 30(5), 1993, pp. 1400-1418
A singularly perturbed boundary-value problem with a multiple turning
point at a boundary is considered. A representation of the solution is
given, and it is used in the construction of a uniform finite-differe
nce scheme. The scheme is a first-order exponentially fitted one. An i
mproved modification on a special discretization mesh is given.