@article{01667758,
title = {On a problem about covering lines by squares.},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {14S},
year = {1986},
zbl = {0983.52006},
language = {en},
url = {http://dml.mathdoc.fr/item/01667758}
}
Kern, Walter; Wanka, Alfred. On a problem about covering lines by squares.. Séminaire Lotharingien de Combinatoire [electronic only], Tome 14S (1986) . http://gdmltest.u-ga.fr/item/01667758/