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I am afraid I do not quite understand your question. Are you asking whether the publications you mention are suitable to serve as a basis for building knowledge about the Empididae?

I would not dare say that, because the articles are unfortunately (at least for me) not available. If you are looking for a starting point, I would go for the books on Empididae in the Fauna Entomologica Scandinavica series, a number of which can be found on the internet with a little searching.