Study shows Brazuca is better than Jabulani

Why this year's World Cup soccer ball may fly more predictably than the 2010 dud - The Washington Post

The science behind the football

XX pasaulio futbolo čempionatas – Vikipedija

XX pasaulio futbolo čempionatas – Vikipedija

2014 World Cup Soccer Brazuca Ball Tests

Study shows Brazuca is better than Jabulani

New World Cup ball 'Brazuca' unveiled to honour Brazil

World Cup Ball Jabulani by Adidas Sparks Complaints - World Cup 2010 - TIME

Inside Brazuca: Science reveals hidden properties of the World Cup ball - The Globe and Mail