@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/