Bernard A. Galler, Michael J. Fischer. The iteration element. Communications of the ACM, 8(6):349, 1965. [doi]
@article{GallerF65,
title = {The iteration element},
author = {Bernard A. Galler and Michael J. Fischer},
year = {1965},
doi = {10.1145/364955.364958},
url = {http://doi.acm.org/10.1145/364955.364958},
researchr = {https://researchr.org/publication/GallerF65},
cites = {0},
citedby = {0},
journal = {Communications of the ACM},
volume = {8},
number = {6},
pages = {349},
}