Kernel-Based Methods for Vector-Valued Data with Correlated Components. - Richard K. Beatson; Wolfgang zu Castell; Stefan J. Schrödl (SIAM J. Sci. Comput., 2011)

Function spaces for conditionally positive definite operator-valued kernels. - Georg Berschneider; Wolfgang zu Castell; Stefan J. Schrödl (Math. Comput., 2012)