Jim Purtilo. On implementing arbitrary precision arithmetic in NIL: an exercise in data abstraction. ACM Comm. Computer Algebra, 14(1):14-18, 1980. [doi]
@article{Purtilo80,
title = {On implementing arbitrary precision arithmetic in NIL: an exercise in data abstraction},
author = {Jim Purtilo},
year = {1980},
doi = {10.1145/1089212.1089215},
url = {http://doi.acm.org/10.1145/1089212.1089215},
researchr = {https://researchr.org/publication/Purtilo80},
cites = {0},
citedby = {0},
journal = {ACM Comm. Computer Algebra},
volume = {14},
number = {1},
pages = {14-18},
}