Sharp Estimates for $p$-Adic Hardy, Hardy-Littlewood-P\'olya Operators   and Commutators
  In this paper we get the sharp estimates of the $p$-adic Hardy and Hardy-Littlewood-P\'olya operators on $L^q(|x|^{\alpha}_pdx)$. Also, we prove that the commutators generated by the $p$-adic Hardy operators (Hardy-Littlewood-P\'olya operators) and the central BMO functions are bounded on $L^q(|x|^{\alpha}_pdx)$, more generally, on Herz spaces. 
Zunwei Fu, Qingyan Wu and Shanzhen Lu
math.FA