Mercedes boss Toto Wolff has warned Lewis Hamilton and Nico Rosberg and their respective engineering teams to maintain an open flow of information after revealing 'transparency is suffering a little bit' amid the team-mate's tight title duel.What looks certain to remain a private battle for the 2014 drivers' crown between Rosberg and Hamilton continues to provide fascinating viewing, and require delicate managing by Mercedes, with the pair securing a one-two race finish for the sixth time this year in Sunday's Austrian GP.Rising tensions between the former karting team-mates blew up in public for the first time at last month's Monaco GP, when Hamilton failed to back his team-mate after...
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