@article{1031710539, author = {Piranian, George}, title = {The derived sets of a linear set.}, journal = {Michigan Math. J.}, volume = {3}, number = {2}, year = {1955}, pages = { 83-84}, language = {en}, url = {http://dml.mathdoc.fr/item/1031710539} }
Piranian, George. The derived sets of a linear set.. Michigan Math. J., Tome 3 (1955) no. 2, pp. 83-84. http://gdmltest.u-ga.fr/item/1031710539/