Reference for Gittin 45:8

איתיביה כשהוא כותבו כאילו כותבו לשמה מאי לאו כשהוא כותבו לתורף לשמה כאילו כותבו לטופס לשמה

What does he mean by saying, 'This is not Torah'? — Said R. Abba: Here [the Mishnah] makes known to us that there is no force in [the ruling that the Get should be written with] 'special intention', and it follows the view of R. Meir who said that it is the signatures of the witnesses which make [the Get] effective. But did not Rabba b. Bar Hana say in the name of R. Johanan that [the Mishnah] follows Rabbi Eleazar? — Two Amoraim<span class="x" onmousemove="('comment',' K. Zerika and Rabbah b. Bar Hanah. ');">⁶</span>

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