Jana Giceva Christoph Lange 0002 Florian Rabe Integrating Web Services into Active Mathematical Documents. 279-293 2009 Calculemus/MKM http://dx.doi.org/10.1007/978-3-642-02614-0_24 conf/mkm/2009 db/conf/mkm/mkm2009.html#GicevaLR09