@ARTICLE{Cheung+LingETAL-leaskerncollmeth:18, author = {Cheung, K. C. and Ling, L. and Schaback, R.}, title = {${H}^2$--Convergence of least-squares kernel collocation methods}, journal = {{SIAM} J. Numer. Anal.}, volume = {56}, number = {1}, pages = {614-633}, year = {2018}, }