TY - JOUR AU - Heinrichs, Wilhelm TI - Spectral methods for singular perturbation problems JO - Applications of Mathematics PY - 1994 SP - 161 EP - 188 VL - 39 IS - 3 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/articles/10.21136/AM.1994.134251/ DO - 10.21136/AM.1994.134251 LA - en ID - 10_21136_AM_1994_134251 ER -