Bordelois, Ivonne On the vacuousness of vacuous operators - 2nd. ed - Cambridge MITWPL 1991 - PP. 1-16 - Papers in linguistics 9 . EN: The 25th anniversary of MIT linguistics 1987 /ed. M.A. Browning. Cambridge : MITWPL, 1991 Inglés Subjects--Topical Terms: /MAESTRIA/