@article{1183530638, author = {Wallen, Lawrence J.}, title = {Semigroups of partial isometries}, journal = {Bull. Amer. Math. Soc.}, volume = {75}, number = {5}, year = {1969}, pages = { 763-764}, language = {en}, url = {http://dml.mathdoc.fr/item/1183530638} }
Wallen, Lawrence J. Semigroups of partial isometries. Bull. Amer. Math. Soc., Tome 75 (1969) no. 5, pp. 763-764. http://gdmltest.u-ga.fr/item/1183530638/