@Article{,
title = {A proof and extension of the Jordan-Brouwer separation theorem},
journal = {Transactions of the American Mathematical Society},
author = {Alexander, J. W.},
year = {1922},
volume = {23},
pages = {333{\textendash}349},
doi = {10.2307/1988883},
url = {http://www.ams.org/journals/tran/1922-023-04/S0002-9947-1922-1501206-6}
}