I knew about that, but I thought it only applied to personal information (with limitations with regards to there being some professional entity collecting it). If I make a statement to the press that goes on print, I cannot demand them recalling papers in order to be compliant with GDPR.
That being said, I am by no means very knowledgeable about this.
Generally speaking, Library Genesis, Anna’s Archive and Sci-Hub are your friends :) Otherwise you can try to email the authors. They will probably provide you with a copy.