@article{03958130, title = {A Helly number for unions of two boxes in }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {8}, year = {1985}, pages = {267-273}, doi = {10.1155/S0161171285000291}, zbl = {0595.52011}, language = {en}, url = {http://dml.mathdoc.fr/item/03958130} }
Breen, Marilyn. A Helly number for unions of two boxes in . International Journal of Mathematics and Mathematical Sciences, Tome 8 (1985) pp. 267-273. doi : 10.1155/S0161171285000291. http://gdmltest.u-ga.fr/item/03958130/