Simon Thomas. On the complexity of the classification problem for torsion-free abelian groups of finite rank. Bulletin of Symbolic Logic, 7(3):329-344, 2001. [doi]
@article{Thomas01:10,
title = {On the complexity of the classification problem for torsion-free abelian groups of finite rank},
author = {Simon Thomas},
year = {2001},
url = {http://www.math.ucla.edu/~asl/bsl/0703/0703-003.ps},
tags = {classification},
researchr = {https://researchr.org/publication/Thomas01%3A10},
cites = {0},
citedby = {0},
journal = {Bulletin of Symbolic Logic},
volume = {7},
number = {3},
pages = {329-344},
}