@article{00850896, title = {Block systems of a Galois group.}, journal = {Experimental Mathematics}, volume = {4}, year = {1995}, pages = {1-9}, doi = {10.1080/10586458.1995.10504303}, zbl = {0976.12006}, language = {en}, url = {http://dml.mathdoc.fr/item/00850896} }
Hulpke, Alexander. Block systems of a Galois group.. Experimental Mathematics, Tome 4 (1995) pp. 1-9. doi : 10.1080/10586458.1995.10504303. http://gdmltest.u-ga.fr/item/00850896/