@article{1102969904,
author = {Borrego, J. T. and Cohen, H. and DeVun, E. E.},
title = {Uniquely representable semigroups on the two-cell.},
journal = {Pacific J. Math.},
volume = {39},
number = {3},
year = {1971},
pages = { 565-569},
language = {en},
url = {http://dml.mathdoc.fr/item/1102969904}
}
Borrego, J. T.; Cohen, H.; DeVun, E. E. Uniquely representable semigroups on the two-cell.. Pacific J. Math., Tome 39 (1971) no. 3, pp. 565-569. http://gdmltest.u-ga.fr/item/1102969904/