$q$-Bessel Fourier Transform and Variation Diminishing kernel
  In this paper we study the variation diminishing kernel as a part of the $q$-calculus. We introduce the $q$-Macdonald function a newborne in the family of the $q$-special functions which play a central role in this study. 
Lazhar Dhaouadi, Saidani Islem and Hedi Elmonser
math.QA