Yuichi Futa, Hiroyuki Okazaki, Yasunari Shidama. Free ℤ-module. Formalized Mathematics, 20(4):275-280, 2012. [doi]
@article{FutaOS12b,
title = {Free ℤ-module},
author = {Yuichi Futa and Hiroyuki Okazaki and Yasunari Shidama},
year = {2012},
url = {http://www.degruyter.com/view/j/forma.2012.20.issue-4/v10037-012-0033-x/v10037-012-0033-x.xml},
researchr = {https://researchr.org/publication/FutaOS12b},
cites = {0},
citedby = {0},
journal = {Formalized Mathematics},
volume = {20},
number = {4},
pages = {275-280},
}