1971 D. Ruelle and F. Takens.
On the nature of turbulence
Comm. math. Phys. 20:167-192 (1971)

1978 S.Newhouse, D. Ruelle, and F. Takens
Occurrence of Strange Axiom A Attractors Near Quasi Periodic Flows on Tm, m__>3
Commun. math. Phys. 64:35--40 (1978)

1981 Notes by F. Takens.
Detecting strange attractors in turbulence.
Do not know where published.