Questions about the limited lending services (Covid-19 measures)

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Where can I find out which areas of the university library are open?
Which regulations have to be observed when using the libraries on site?
What are the conditions for borrowing and returning?
Which UB services help to use the university library from home?
Which virtual services are available?
Can I get literature that is not available at the University Library?
Can I get scans of print literature available at the Vienna University Library?
How can I receive or extend a library card?