1. PayPal web service API documentation (2008),
http://www.paypal.com
2. soapUI: the web services testing tool (2009),
http://www.soapui.org/
3. Amazon web services,
http://solutions.amazonwebservices.com/
4. Bai, X., Dong, W., Tsai, W.-T., Chen, Y.: WSDL-based automatic test case generation for web services testing. In: IEEE International Workshop on Service-Oriented System Engineering, SOSE 2005, pp. 207–212 (2005)
5. Barbon, F., Traverso, P., Pistore, M., Trainotti, M.: Run-time monitoring of instances and classes of web service compositions. In: Proceedings of the 2006 IEEE International Conference on Web Services (ICWS 2006), pp. 63–71 (2006)