@InProceedings{ay-aart-89,
author = { Helmut Alt and Chee K. Yap },
title = { Algorithmic Aspects of Robotics: a Tutorial },
booktitle = { Proceedings SOFSEM `89 },
year = { 1989 },
pages = { 7-40 },
} @InProceedings{ay-mpce-89,
author = { Helmut Alt },
title = { Motion Planning in the {CL}-Environment },
booktitle = { Proc. 2nd Workshop Algorithms Data Struct. },
year = { 1989 },
volume = { 382 },
publisher = { Springer-Verlag },
series = { Lecture Notes Comput. Sci. },
pages = { 373-380 },
}