@article{GDZPPN002363135, title = {A Best Covering Problem.}, journal = {Mathematica Scandinavica}, volume = {77}, year = {1995}, pages = {272-280}, zbl = {0868.46020}, url = {http://dml.mathdoc.fr/item/GDZPPN002363135} }
Knudsen, F.F.; Seip, K.; Ulanovskii, A.M. A Best Covering Problem.. Mathematica Scandinavica, Tome 77 (1995) pp. 272-280. http://gdmltest.u-ga.fr/item/GDZPPN002363135/