@article{1255455001, author = {Heller, Alex}, title = {A note on spaces with operators}, journal = {Illinois J. Math.}, volume = {3}, number = {1}, year = {1959}, pages = { 98-100}, language = {en}, url = {http://dml.mathdoc.fr/item/1255455001} }
Heller, Alex. A note on spaces with operators. Illinois J. Math., Tome 3 (1959) no. 1, pp. 98-100. http://gdmltest.u-ga.fr/item/1255455001/