@unpublished{Michel2006, author = {Volker Michel}, title = {Fast Approximation on the 2-Sphere by Optimally Localized Approximate Identities}, institution = {Fachbereich Mathematik}, series = {Schriften zur Funktionalanalysis und Geomathematik}, number = {29}, year = {2006}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-14710}, }