@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/