1. Alonso, G., Casati, F., Kuno, H., Machiraju, V. (eds.): Web Services: Concepts, Architectures and Applications. Springer, Heidelberg (2004)
2. Du, W., Elmagarmid, A.: Workflow management: State of the art vs. state of the products. Technical Report HPL-97-90, Hewlett-Packard Labs, Palo Alto, CA, USA (1997)
3. Andrews, T., Curbera, F., Dholakia, H., Goland, Y., Klein, J., Leymann, F., Liu, K., Roller, D., Smith, D., Thatte, S., Trickovic, I., Weerawarana, S.: Business Process Execution Language for Web Services version 1.1 (2003), http://www.ibm.com/developerworks/library/ws-bpel/
4. Leymann, F.: Web Services Flow Language (WSFL 1.0). IBM (2001)
5. Thatte, S.: XLANG — web services for business process design. Microsoft (2001), http://www.gotdotnet.com/team/xml_wsspecs/xlang-c/default.htm