Where were the details of Margulis's 1969 paper published?

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I am referring to "G. A. Margulis. Certain applications of ergodic theory to the investigation of manifolds of negative curvature. Functional Anal. Appl. 3 (1969), no. 4, 335–336" which is a two-page announcement of results. (https://doi.org/10.1007%2FBF01076325)