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.

It is a joke, there are no ads. I just wrote a fake command in the Nix syntax.

LPT: In NixOS you can fix this by adding

environment.systemAds.enable = false;

to your configuration.nix file 😎

American left-wing values

Hold up, what? The Overton window of US politics is so skewed to the right that what is usually considered left-wing there is right-wing elsewhere. US left-wing (read right-wing for much of the rest of the world) values are definitely common globally due to American cultural export (read military hegemony and neocolonialism).