TY - BOOK A1 - Shazer, S. de T1 - Clues. Investigating Solutions in Brief Therapy. New York (Norton) 1979. Y1 - 1979 N1 - Ex libris Marco Bacciagaluppi ER - TY - BOOK A1 - Shazer, S. de T1 - Putting Difference to Work. New York (Norton) 1991. Y1 - 1991 N1 - Ex libris Marco Bacciagaluppi ER -