Reference for Yevamot 83:2

הוי הג' חדשים שאמרו משעת מיתת הבעל ולא משעת חליצת היבם

Why [is the law here]<span class="x" onmousemove="('comment',' Halizah. ');">²</span> different from that of a letter of divorce where Rab maintains [that the waiting period is to date] from the time of the delivery<span class="x" onmousemove="('comment',' Of the letter of divorce to the woman. ');">³</span>

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