A probabilistic technique for finding almost-periods of convolutions by Ernie Croot and Olof Sisask (2010 preprint)

Original author manuscript: ecroot.math.gatech.edu/prob-almost-periods.pdf

Preprint record: arxiv.org/abs/1003.2978

Section 1.1 specifies counting convolution and counting Lp norms; propositions 1.1 and 1.3 state local almost-periodicity; section 3 gives the sampling proof, and section 9.1 discusses functions.