@article{GDZPPN00221198X,
title = {Fourier integral operators with fold singularities.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {450},
year = {1994},
pages = {35-56},
zbl = {0799.42008},
url = {http://dml.mathdoc.fr/item/GDZPPN00221198X}
}
Seeger, Andreas; Greenleaf, Allan. Fourier integral operators with fold singularities.. Journal für die reine und angewandte Mathematik, Tome 450 (1994) pp. 35-56. http://gdmltest.u-ga.fr/item/GDZPPN00221198X/