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Williams will dedicate more resources to improving their current Formula One car after recent poor performances, co-owner Patrick Head has said.
The former champions, who started the season with a podium when Germany's Nico Rosberg came third in Australia, have suffered a string of disappointing results with the car quick at some circuits and lacking performance at others.
Rosberg has also failed to score a point in his last four races, crashing in Monaco and Canada, where he ran into the back of Lewis Hamilton's McLaren.
