@article{GDZPPN002418711, title = {The Equations s-1 t-1st=u-1 v-1 uv in a Free Product of Groups.}, journal = {Mathematische Zeitschrift}, volume = {154}, year = {1977}, pages = {83-88}, url = {http://dml.mathdoc.fr/item/GDZPPN002418711} }
Burns, Robert G.; Edmunds, Charles C. The Equations s-1 t-1st=u-1 v-1 uv in a Free Product of Groups.. Mathematische Zeitschrift, Tome 154 (1977) pp. 83-88. http://gdmltest.u-ga.fr/item/GDZPPN002418711/