@article{M2AN_1987__21_3_405_0,
     author = {Bamberger, Alain and Coron, Fran\c{c}ois and Ghidaglia, Jean-Michel},
     title = {An analysis of the {B.P.M.} approximation of the {Helmholtz} equation in an optical fiber},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {405--424},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {21},
     number = {3},
     year = {1987},
     mrnumber = {908238},
     zbl = {0626.65136},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1987__21_3_405_0/}
}