@incollection{fau-sch-98-fitt,
  author = {G. E. Fausshauer and L. L. Schumaker},
  title = {Scattered Data Fitting on the Sphere},
  booktitle = {Mathematical Methods for Curves and Sufaces},
  pages = {117--166},
  year = 1998,
  publisher = {Vanderbilt University Press, Nashville, TN}
}