@unpublished{publication-5451, author={Artis, Michael J and Clavel, José G and Hoffmann, Mathias and Nachane, Dilip}, institution={University of Zurich}, issn={1424-0459}, number={No. 333}, series={Working paper series / Institute for Empirical Research in Economics}, title={Harmonic Regression Models: A Comparative Review with Applications}, year=2007, }