I am trying to understand how estimates on sublevel integrals imply estimates on oscillatory integrals. Specifically in this article by M. Greenblatt it says on page 7:
By well-known methods relating sublevel integrals to oscillatory integrals, the above results about [some sublevel integral] have direct implications for [some oscillatory integral].
These methods are not known to me. Can anyone point me to a book or paper, which treats this in detail?