Which authors have written a paper with title containing the word "Monadic"? Return their last names.
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 WHERE t3.title LIKE "%Monadic%"
authors who have written a paper = JOIN operation between authors, authorship, and papers tables; paper title containing the word 'Monadic' refers to WHERE t3.title LIKE '%Monadic%'; return their last names refers to SELECT t1.lname;