2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59631Sharp L^2 estimates for oscillatory integral operators and Fourier integral operators associated with canonical relations having two-sided cusp or one-sided swallowtail singularities are obtained.Final version, with a few misprints corrected. To appear, Duke Math. JourClassical Analysis and ODEs35S30, 42B99, 58K35text