"densest packing of disks" . "circle packing" . "these gaps occupy about 25% of the wire area" . . "octagonal fashion" . . "Circle packing#Unequal" . "Circle packing" . "circle packings" . "Circle packing" . . . "packing a given number of circles" . . . . "maximum packing density of circles" . "packing circles" . "Circle" . "packing of circles" . "geometrical reasons" . "hexagonal packing" . . . .