2591.
Schmidt (Gernot): Das keltische und das germanische t-Praeteritum.
In ZCP 36 (1978), pp. 13–22.
Argues that the derivation of the OIr. t-preterite from a PIE s-aorist is impossible, and supports instead the view it spread from a 3sg. resulting from a PIE (non-middle) ending *-to added to the perfect stem.

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