@techreport{DraheimNeunSuliman2004, author = {Dirk Draheim and Winfried Neun and Dima Suliman}, title = {Searching and Classifying Differential Equations on the Web}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {04-22}, language = {eng}, year = {2004} }