Docs about protocols used in Tor

Hi I’m looking for an “official” reference to the following protocols, unfortunately I can find few documents by searching independently and they often lack technical specifications or I don’t know if they were modified before being published, can anyone in the community help me?

I have no way to verify whether the documents have been edited or not pre because I could not find them under the torproject domain and, therefore, I would like to be sure of the source.

If anyone knows the official paper of these releases (assuming there is one) that would be ideal.

  • obfs3
  • obfs4
  • ScrambleSuit
  • UniformDH
  • ntor handshake
  • Curve25519
  • Elligator 2

What i found is this links: