@article{10_21136_AM_1994_134251,
     author = {Heinrichs, Wilhelm},
     title = {Spectral methods for singular perturbation problems},
     journal = {Applications of Mathematics},
     pages = {161--188},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {1994},
     doi = {10.21136/AM.1994.134251},
     mrnumber = {1273631},
     zbl = {0812.65100},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/AM.1994.134251/}
}