Relative reproducing kernels in vector-valued Hilbert and Banach spaces
  This paper is devoted to the study of vector valued reproducing kernel Hilbert spaces. We focus on reproducing kernels in vector-valued reproducing kernel Hilbert spaces. In particular we extend reproducing kernels to relative reproducing kernels and prove some theorems in this subject. 
Ali Ebadian and Saeed Hashemi Sababe
math.FA