@article{JRAM_1994__455_153653,
     author = {Andreas Seeger and Allan Greenleaf},
     title = {Fourier integral operators with fold singularities.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {35--56},
     publisher = {mathdoc},
     volume = {455},
     year = {1994},
     zbl = {0799.42008},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1994__455_153653/}
}