“…[88,89,67,79,81,82,140,112]. The detailed "method of stationary phase" (in the case where the critical manifolds are degenerate) has extremely interesting connections with the theory of resolution of singularities of mappings (and catastrophe theory), see, e.g., [36,56,67,4,13,20]. Due to the fact that oscillatory integrals are finite but in general not absolutely convergent, looked upon as linear functionals they have their own definition domains and continuity properties, different from those of the absolutely convergent integrals with respect to measures on measurable spaces.…”