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How to add and use external assemblies in solutions?

I need to use DocumentFormat.OpenXml.dll in my code. In the solution package, I included this external dll in the Additional Assemblies. It looks like this: I also need to reference it, so that I ...
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vote
2answers
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The type or namespace name 'X' could not be found (are you missing a using directive or an assembly reference?)

I have a weird problem I just can't place. I have a SP 2010 project which contains two sub-projects of type class library (FirstLib and SecondLib). The project build fine, no errors whatsoever, ...