1. Anderson , S. , Grau , A. , and Hughes , C. 2005 . Specification and satisfaction of SLAs in service oriented architectures . In 5th Annual DIRC Research Conference , Edinburgh , UK , 141 – 150 .
2. Ardagna , D. and Pernici , B. 2005 . Global and local QoS constraints guarantee in web service selection . In IEEE International Conference on Web Services (ICWS'i 05) , Orlando , FL , USA , 805 – 806 .
3. Techniques to Produce Optimal Web Service Compositions
4. The Complexity of Flowshop and Jobshop Scheduling
5. Optimization and Approximation in Deterministic Sequencing and Scheduling: a Survey