Reference for Chullin 37:34

לישנא אחרינא אמרי לה אמר רב הונא אמר רב אסי

Another version of the above reads as follows: R'Huna said in the name of R'Assi: They differ only where the slaughterer first cut a third above [the top ring] and then the other two thirds in it - according to R'Jos son of R'Judah it is analogous with the case where half the windpipe was mutilated [before the slaughtering] and according to the Rabbis [it is to be distinguished thus:] in the latter case [the mutilation was] within the prescribed area for slaughtering, whereas in our case [the cutting of the first third] was outside the prescribed area for slaughtering.

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