Reference for Menachot 65:9

בשלמא לרב הונא הוא דאמר כר' יהודה אלא לשמואל דאמר כמאן לא כר' יהודה ולא כר' יוסי

too cannot be, for the door through which R'Huna used to enter the House of Study had a mezuzah! - That [door] was used more frequently [than the others]. And Rab Judah has said in the name of Rab that in the law of mezuzah one must decide upon the [door] most frequently used.<span class="x" onmousemove="('comment',' I.e., in a room which has more than one door the mezuzah must be affixed to that door which is most frequently used.');">¹¹</span>

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