@article{00639830,
title = {On a theorem of P. E. Schupp. (Sur un th\'eor\`eme de P. E. Schupp.)},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {231-233},
zbl = {0818.16028},
language = {en},
url = {http://dml.mathdoc.fr/item/00639830}
}
Ben Yakoub, L. On a theorem of P. E. Schupp. (Sur un théorème de P. E. Schupp.). Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 231-233. http://gdmltest.u-ga.fr/item/00639830/