published posthumously
... that more than 60 scientific papers authored by mathematician Paul Erdős were published posthumously?
... that more than 60 scientific papers authored by mathematician <a href="./Paul_Erdős" id="mwBYM" rel="mw:WikiLink" title="Paul Erdős">Paul Erdős</a> were <b id="mwBYQ"><a href="./Posthumous_publication" id="mwBYU" rel="mw:WikiLink" title="Posthumous publication">published posthumously</a></b>?