David Gries. Is Sometimes Ever Better Than Alway?. ACM Transactions on Programming Languages and Systems, 1(2):258-265, 1979. [doi]
@article{Gries79:0,
title = {Is Sometimes Ever Better Than Alway?},
author = {David Gries},
year = {1979},
doi = {10.1145/357073.357080},
url = {http://doi.acm.org/10.1145/357073.357080},
researchr = {https://researchr.org/publication/Gries79%3A0},
cites = {0},
citedby = {0},
journal = {ACM Transactions on Programming Languages and Systems},
volume = {1},
number = {2},
pages = {258-265},
}