1. Ueber die stetige Abbildung einer Line auf ein Fl�chenst�ck
2. Algorithm 781
3. . Optimizing raster storage: An examination of four alternatives. Proceedings of the 6th International Symposium on Automated Cartography, Ottawa, ON, Canada, 1983; 400–407.
4. . On the metric properties of discrete space-filling curves. Proceedings of International Conference on Pattern Recognition, vol. 3. IEEE Press: Piscataway, NJ, 1994; 98–102.