Reference for Yevamot 200:2

היה אחד ישראל ואחד כהן נושא אשה ראויה לכהן ואין מטמא למתים ואם נטמא אינו סופג את הארבעים אינו אוכל בתרומה ואם אכל אינו משלם קרן וחומש ואינו חולק על הגורן ומוכר התרומה והדמים שלו

MAY EITHER SUBMIT TO <i>HALIZAH</i> OR CONTRACT THE LEVIRATE MARRIAGE,<span class="x" onmousemove="('comment',' If there were no other surviving brothers. The widow is either his sister-in-law with whom levirate marriage is lawful, or a stranger with whom he may contract an ordinary marriage. ');">³</span> BUT AS FOR THEM, ONE<span class="x" onmousemove="('comment',' Either a son of the first, or a son of the second husband. ');">⁴</span> SUBMITS TO <i>HALIZAH</i><span class="x" onmousemove="('comment',' From the widow of the son whose father is unknown, if he died childless. ');">⁵</span> AND THE OTHER MAY [THEN] CONTRACT LEVIRATE MARRIAGE.<span class="x" onmousemove="('comment',' Since the widow is either his sister-in-law and the levirate marriage with her is lawful, or she is a stranger and permitted to marry him because her brother-in-law had submitted to her halizah. ');">⁶</span>

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