@techreport{Axelssonetal:10,
    author = "Axelsson, Patrik and Orguner, Umut and Gustafsson, Fredrik and Norrl{\"{o}}f, Mikael",
    title = "ML Estimation of Process Noise Variance in Dynamic Systems",
    institution = "Department of Electrical Engineering, Linköping University",
    year = "2010",
    month = Oct,
    address = "SE-581 83 Linköping, Sweden",
    URL = "http://www.control.isy.liu.se/publications/doc?id=2334",
    number = "LiTH-ISY-R-2969",
}