@article{1102995093, author = {Robkin, E. E. and Valentine, F. A.}, title = {Families of parallels associated with sets.}, journal = {Pacific J. Math.}, volume = {19}, number = {3}, year = {1966}, pages = { 147-157}, language = {en}, url = {http://dml.mathdoc.fr/item/1102995093} }
Robkin, E. E.; Valentine, F. A. Families of parallels associated with sets.. Pacific J. Math., Tome 19 (1966) no. 3, pp. 147-157. http://gdmltest.u-ga.fr/item/1102995093/