Sherman R. Alpert. Graceful interaction with graphical constraints. IEEE Computer Graphics and Applications, 13(2):82-91, 1993. [doi]
@article{Alpert93,
title = {Graceful interaction with graphical constraints},
author = {Sherman R. Alpert},
year = {1993},
doi = {10.1109/38.204971},
url = {http://doi.ieeecomputersociety.org/10.1109/38.204971},
researchr = {https://researchr.org/publication/Alpert93},
cites = {0},
citedby = {0},
journal = {IEEE Computer Graphics and Applications},
volume = {13},
number = {2},
pages = {82-91},
}