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How can I access a document inside a topic?

If you know the name of the paper you are looking for and the sequel of pretreatments that is described in it, you can open the associated topic (in the Documents tab) by clicking on the small arrow next to it (on the left side of each topic).

Topics descriptions are listed in the FAQ at the question What do the topics’ names stand for?

Once you have found the document you need, just click on its name; if you are logged in, you should be able to click on Download the PDF file which will give you access to the paper.