@article{1028998183, author = {Bagemihl, F.}, title = {Some opaque subsets of a square.}, journal = {Michigan Math. J.}, volume = {6}, number = {1}, year = {1959}, pages = { 99-103}, language = {en}, url = {http://dml.mathdoc.fr/item/1028998183} }
Bagemihl, F. Some opaque subsets of a square.. Michigan Math. J., Tome 6 (1959) no. 1, pp. 99-103. http://gdmltest.u-ga.fr/item/1028998183/