27th annual Symposium on Foundations of Computer Science / 28th Annual Symposium on Foundations of Computer Science : 18th Annual Symposium on Foundations of Computer Science. 20th Annual Symposium on Foundations of Computer Science. 22nd annual symposium on Foundations of Computer Science / 24th Annual Symposium on Foundations of Computer Science / 25th Annual Symposium on Foundations of Computer Science : 26th Annual Symposium on Foundations of Computer Science / 23rd annual Symposium on Foundations of Computer Science / 30th Annual Symposium on Foundations of Computer Science :