@article{GDZPPN001258842,
title = {Normal forms for band free products.},
journal = {Semigroup forum},
volume = {33},
year = {1986},
pages = {265-278},
zbl = {0615.20040},
url = {http://dml.mathdoc.fr/item/GDZPPN001258842}
}
Olin, P. Normal forms for band free products.. Semigroup forum, Tome 33 (1986) pp. 265-278. http://gdmltest.u-ga.fr/item/GDZPPN001258842/