@article{GDZPPN002427044, title = {Hyperplane Coverings and Blocking Sets.}, journal = {Mathematische Zeitschrift}, volume = {180}, year = {1982}, pages = {407-410}, zbl = {0491.51013}, url = {http://dml.mathdoc.fr/item/GDZPPN002427044} }
Bruen, Aiden A.; Thas, Joseph Adolphe. Hyperplane Coverings and Blocking Sets.. Mathematische Zeitschrift, Tome 180 (1982) pp. 407-410. http://gdmltest.u-ga.fr/item/GDZPPN002427044/