Michael L. Powell, Mark A. Linton. Visual abstraction in an interactive programming environment. SIGPLAN Notices, 18(6):14-21, 1983. [doi]
@article{PowellL83-0,
title = {Visual abstraction in an interactive programming environment},
author = {Michael L. Powell and Mark A. Linton},
year = {1983},
doi = {10.1145/872728.806847},
url = {http://doi.acm.org/10.1145/872728.806847},
researchr = {https://researchr.org/publication/PowellL83-0},
cites = {0},
citedby = {0},
journal = {SIGPLAN Notices},
volume = {18},
number = {6},
pages = {14-21},
}