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How could I found prior art

In reference to the patent: US20150012878 How could I found the prior art for this?
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Patent WO 2014122535 A2 (US 14/172,685): User Interface, prior art exists

I studied this patent (pending) and it seems obvious to me that prior art apply on: System for organizing and displaying information on a display device WO2014122535A2 US20140223313 Application ...
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UI Interface on Paper53?

Is the UI interface on Paper53 patented? Specifically, the screen with the open book where you flip between the pages.