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@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/} }
Hans Melissen. Densest Packing of Six Equal Circles in a Square.. Elemente der Mathematik, Tome 49 (1994) no. 1, pp. 27-31. http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141556/