@inbook { WBJ*:2003, title = {Hierarchical Spline Approximations}, booktitle = {Hierarchical and Geometrical Methods in Scientific Visualization}, year = {2003}, pages = {63-88}, publisher = {Springer}, organization = {Springer}, address = {Berlin, Germany}, author = {Wiley, D.F. and Bertram, M. and Jordan, B.W. and Bernd Hamann and Joy, K. and Max, N.L. and Gerik Scheuermann}, editor = {Farin, G. and Bernd Hamann and Hans Hagen} }