Reference for Menachot 5:9

הָאוֹמֵר הֲרֵי עָלַי בַּתַּנּוּר, לֹא יָבִיא מַאֲפֵה כֻפָּח וּמַאֲפֵה רְעָפִים וּמַאֲפֵה יוֹרוֹת הָעַרְבִיִּים. רַבִּי יְהוּדָה אוֹמֵר, אִם רָצָה, יָבִיא מַאֲפֵה כֻפָּח. הֲרֵי עָלַי מִנְחַת מַאֲפֶה, לֹא יָבִיא מֶחֱצָה חַלּוֹת וּמֶחֱצָה רְקִיקִין. רַבִּי שִׁמְעוֹן מַתִּיר, מִפְּנֵי שֶׁהוּא קָרְבָּן אֶחָד:

[If one said,] “I take upon myself [to offer a grain offering baked] in an oven,” he must not bring what is baked in a stove or on tiles or in the cauldrons of the Arabs; Rabbi Judah says: he may bring what is baked in a stove. [If he said,] “I take upon myself [to offer] a baked grain offering,” he may not bring half in loaves and half in wafers. Rabbi Shimon permits it for it is one [kind of] offering.

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