Niklaus Wirth, Helmut Weber. EULER: a generalization of ALGOL, and its formal definition: Part II. Communications of the ACM, 9(2):89-99, 1966. [doi]
@article{WirthW66a,
title = {EULER: a generalization of ALGOL, and its formal definition: Part II},
author = {Niklaus Wirth and Helmut Weber},
year = {1966},
doi = {10.1145/365170.365202},
url = {http://doi.acm.org/10.1145/365170.365202},
researchr = {https://researchr.org/publication/WirthW66a},
cites = {0},
citedby = {0},
journal = {Communications of the ACM},
volume = {9},
number = {2},
pages = {89-99},
}