SELECT t1.lname FROM authors AS t1 JOIN authorship AS t2 ON t1.authid  =  t2.authid JOIN papers AS t3 ON t2.paperid  =  t3.paperid GROUP BY t1.fname ,  t1.lname ORDER BY count(*) DESC LIMIT 1
Which author has written the most papers? Find his or her last name.
SELECT t1.lname FROM authors AS t1 JOIN authorship AS t2 ON t1.authid = t2.authid JOIN papers AS t3 ON t2.paperid = t3.paperid GROUP BY t1.fname , t1.lname ORDER BY count ( * ) DESC LIMIT 1
select t1 . lname from authors as t1 join authorship as t2 on t1 . authid = t2 . authid join papers as t3 on t2 . paperid = t3 . paperid group by t1 . fname , t1 . lname order by count ( * ) desc limit value
Which author has written the most papers ? Find his or her last name .