On the $\ell^s$-boundedness of a family of integral operators
  In this paper we prove an $\ell^s$-boundedness result for integral operators with operator-valued kernels. The proofs are based on extrapolation techniques with weights due to Rubio de Francia. The results will be applied by the first and third author in a subsequent paper where a new approach to maximal $L^p$-regularity for parabolic problems with time-dependent generator is developed. 
Chiara Gallarati, Emiel Lorist, Mark Veraar
math.CA math.FA