@article{M2AN_2000__34_6_1203_0,
     author = {Runborg, Olof},
     title = {Some new results in multiphase geometrical optics},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {1203--1231},
     year = {2000},
     publisher = {Dunod},
     volume = {34},
     number = {6},
     mrnumber = {1812734},
     zbl = {0972.78001},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_2000__34_6_1203_0/}
}