@article{sanders,
author = {Sanders, Norman},
title = {An industry perspective on the beginnings of CAD},
journal = {SIGCSE Bulletin},
volume = {40},
number = {2},
year = {2008},
issn = {0097-8418},
pages = {128--134},
doi = {http://doi.acm.org/10.1145/1383602.1383652},
publisher = {ACM},
address = {New York, NY, USA},
}
$$
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$$