Hi all, 

I am looking for this article:
F.M.Gardner, Demodulator Reference Recovery Techniques Suited for Digital
Implementation, European Space Agency, Final Report

Does anyone have access to it or know where I can request access to this document?
Thanks in advance

From the citations that come up on a google search it looks to be a very old article, pre-1991 at least.  What are you looking to do?

F. M. Gardner, ‘ Demodulator reference recovery techniques suited for digital implementation’, Final Report to ESTEC Contract 6847/86/NL/DG, ESA Report CR(X) 2737, August 1988.

Yeah, very old.  The state of the art has changed since then.

Found this:

https://www.inknowvation.com/sbir/companies/gardne...

which contained this:

1755 University Avenue
Palo Alto, CA 94301

Looks like he's been in the game for a while. Hopefully, he's still on the planet. If not and his company still exists perhaps someone there can give you a little further information.