@inproceedings{OhlssonRL:08b,
    author = "Ohlsson, Henrik and Roll, Jacob and Ljung, Lennart",
    title = "Manifold-Constrained Regressors in System Identification",
    year = "2008",
URL = "http://www.control.isy.liu.se/publications/doc?id=2131",
    month = Apr,
    address = "Luleå, Sweden",
    booktitle = "Proceedings of Reglermöte 2008",
}