@ARTICLE{
TITLE="Best Achievable Tracking Performance in Sampled-Data Systems via LTI Controllers",
AUTHOR="J. Chen, S. Hara, L. Qiu, and R.H. Middleton",
YEAR="2008",
VOLUME="53",
NUMBER="11",
PAGES="2467-2479",
JOURNAL="IEEE Transactions on Automatic Control"
}