Reference

sutherland
@inproceedings{sutherland,
 author = {Sutherland, Ivan E.},
 title = {Sketchpad a man-machine graphical communication system},
 booktitle = {25 years of DAC: Papers on Twenty-five years of electronic design automation},
 year = {1988},
 isbn = {0-89791-267-5},
 pages = {507--524},
 doi = {http://doi.acm.org/10.1145/62882.62943},
 publisher = {ACM},
 address = {New York, NY, USA},
 }