Hopefully you can open this, which was a fairly extensive research into optimal recovery actions.
https://www.aerosociety.com/Assets/D...urnal/3965.pdf
If that didn't work, try this link:
https://bura.brunel.ac.uk/bitstream/.../Fulltext.docx
It didn't actually look into the absurdity of picking up a dropped wing with rudder, which I think most of us know more correctly by the name "spin entry". It concluded that optimal recovery is simultaneous pitch and power in all singles tested.
G