Robert Kubica understands why people may have doubts on him returning to Formula 1 but believes that he will prove them wrong.  "If I would be a team principal I would also have doubts," Kubica said to F1i.com.  "This year has been very useful because the first meeting, I remember, I said 'If you have any doubt, we shouldn't be doing it, because in difficult times it's easy to point the finger on my arm – I want to make sure that you are sure that I can do it'. "First of all I have to be sure that I can do it, that's why I'm here, but second of all the team has to be convinced that I'm able to do a job." Kubica has proved his doubters wrong in...
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