A sufficient condition of Pólya type is given for a function to be the Fourier transform of a unimodal distribution. This condition is used to show that exp(- | x |3- 3 | x |) is the Fourier transform of a unimodal distribution. © 1975.
Askey, R. (1975). Some characteristic functions of unimodal distributions. Journal of Mathematical Analysis and Applications, 50(3), 465–469. https://doi.org/10.1016/0022-247X(75)90003-7