@article{ELMA_1994__49_1_141556,
     author = {Hans Melissen},
     title = {Densest {Packing} of {Six} {Equal} {Circles} in a {Square.}},
     journal = {Elemente der Mathematik},
     pages = {27--31},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1994},
     zbl = {0807.52013},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141556/}
}