@techreport{DeuflhardNowakLutzWestphal2007, author = {Peter Deuflhard and Ulrich Nowak and Brigitte Lutz-Westphal}, title = {Bessel'scher Irrgarten}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {07-09}, language = {deu}, year = {2007} }