M. Dücker, C. Geiger, R. Hunstock, G. Lehrenfeld, and W. Müller, “Visual-Textual Prototyping of 4D Scenes,”10.1109/VL.1997.626601__presented at the 1997 IEEE Symposium on Visual Languages, 1997, doi:10.1109/VL.1997.626601 .