Reference for Menachot 83:8

ואי מדרבי יעקב הוה אמינא מלא קשר גודל דלא ליקרב טפי וכמה דרחיק מעלי צריכא

For from R'Papa's teaching I only know that it must be within three fingerbreadths' distance from the corner and not farther away than that, but the nearer it is [to the corner] the better; therefore R'Jacob's teaching was necessary. An from R'Jacob's teaching I only know that it must be away from the corner the distance of the first joint of the thumb and not nearer than that, but the farther away it is [from the corner] the better; therefore [both teachings] are necessary.

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