SUPPLEMENT Heading in football. Part 3: Effect of ball ...

specifications in the Fe´de´ration Internationale de Football Association (FIFA) Laws of the Game specifying a circumfer-ence of 680–720 mm and mass of 410–450 g. Inflation pressures of 600–1100 g/cm2 (0.6–1.1 bar) are also specified along with leather or other suitable cover material. ................
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