Can anyone please send a link to this article?
I. Z. RUZSA AND E. SZEMEREDI, Triple systems with no six points carrying three
triangles, Colloq. Math. Sot. Junos Bolyai 18 (1978), 939-945.
It is needed for the proof of this theorem.
Suppose that $F$ is a linear $3$-graph on $n$ vertices which contains no triangle. Then $|F| = o(n^2)$.
Maybe this one? You may need to sign in.