@Article{,
title = {Note on two three-dimensional manifolds with the same group},
journal = {Transactions of the American Mathematical Society},
author = {Alexander, J. W.},
year = {1919},
volume = {20},
pages = {339{\textendash}342},
doi = {10.2307/1988806},
url = {http://www.ams.org/journals/tran/1919-020-04/S0002-9947-1919-1501131-0}
}