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@article{DCG_1986__1_130989, author = {H. Groemer}, title = {Some {Basic} {Properties} of {Packing} and {Covering} {Constants.}}, journal = {Discrete & computational geometry}, pages = {183--193}, publisher = {mathdoc}, volume = {1}, year = {1986}, zbl = {0599.52006}, url = {http://geodesic.mathdoc.fr/item/DCG_1986__1_130989/} }
H. Groemer. Some Basic Properties of Packing and Covering Constants.. Discrete & computational geometry, Tome 1 (1986), pp. 183-193. http://geodesic.mathdoc.fr/item/DCG_1986__1_130989/