1. Becker, R. A., Cleveland, W. S. and Wilks, A. R. (1988). 'Dynamic graphics for data analysis', Dynamic Graphics for Statistics, ed. by Cleveland, W. S. and McGill, M. E., pp. 331–50, Wandsworth, California.
2. Cartwright, W., Peterson, M. P., Gartner, G. (eds) (1999). Multimedia Cartography, Springer-Verlag Berlin Heidelberg, Germany.