@article{MOMA_1967__71_177379,
     author = {Rajinder Jeet Hans},
     title = {Extremal {Packing} and {Covering} {Sets.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {203--213},
     publisher = {mathdoc},
     volume = {71},
     year = {1967},
     zbl = {0256.52013},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1967__71_177379/}
}