@article{GDZPPN001265547, title = {Amalgams of free inverse semigroups.}, journal = {Semigroup forum}, volume = {54}, year = {1997}, pages = {199-220}, zbl = {0872.20049}, url = {http://dml.mathdoc.fr/item/GDZPPN001265547} }
Cherubini, A.; Meakin, J.; Piochi, B. Amalgams of free inverse semigroups.. Semigroup forum, Tome 54 (1997) pp. 199-220. http://gdmltest.u-ga.fr/item/GDZPPN001265547/