• up-to-date libgen and sci-hub addresses:
  

  libgen.is

  sci-hub.st

• University of Warsaw Choir (Chór Akademicki Uniwersytetu Warszawskiego):
  

  webpage

  youtube channel

The following is a program in Haskell that prints its own code as an output:

(++)<*>show$"(++)<*>show$"

(here you can find an explanation of how it works).

And this is a link to a paper about self-referentiality (in polish).

It was published in Delta, a lovely pop-sci magazine (Vol. 5/2021 (564), to be specific).