Proceedings of the Third ACD SIGACT-SIGMOD Symposium on Principles of Database Systems : Proceedings of the 3rd ACD SIGACT-SIGMOD Symposium on Principles of Database Systems Proceedings of the 5th ACM SIGACT-SIGMOD Symposium on Principles of Database Systems Proceedings of the Fifth ACM SIGACT-SIGMOD Symposium on Principles of Database Systems : Fifth ACM SIGACT-SIGMOD Symposium on Principles of Database Systems Proceedings of the 20th Midwest Symposium on Circuits and Systems Proceedings of the 26th Midwest Symposium on Circuits and Systems 5th ACM SIGACT-SIGMOD Symposium on Principles of Database Systems Proceedings of the third International Symposium on Plasticity and Impact Proceedings of the International Symposium on Wind energy systems.