Analysis of information sources in references of the Wikipedia article "Leviticus 18" in English language version.
16. There is curiously no reference here to the so-called Levirate marriage, at one time practiced in Israel, whereby, if a man died childless, his brother would take his wife in order to raise up descendants for him. (Deut. 25:5-10). [...] 21. So-called Levirate marriage is presumably excepted (see Deut. 25:5 ff.).