On the occasion of the failed negotiations with SpringerNature, swissuniversities published a factsheet on how to get papers without a campus license.

I would like to add point 9.

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Update: Tweet by SpringerNature from December 19:

We’re highly disappointed that thus far we’ve been unable to reach an agreement with @CH_universities for 2020. We’re continuing discussions and Swiss researchers will still be able to access all our existing and newly published 2020 journal content until further notice.