Pötzelberger, Klaus and Strasser, Helmut (1997) Data Compression by Unsupervised Classification. Forschungsberichte / Institut für Statistik, 52. Department of Statistics and Mathematics, WU Vienna University of Economics and Business
Müller, Werner and Zimmerman, Dale L. (1997) Optimal Design for Variogram Estimation. Forschungsberichte / Institut für Statistik, 51. Department of Statistics and Mathematics, WU Vienna University of Economics and Business
Müller, Werner (1997) On Least Squares Variogram Fitting. Forschungsberichte / Institut für Statistik, 50. Department of Statistics and Mathematics, WU Vienna University of Economics and Business