6Polyzois I, Claffey N, Mattheos N. Problem- based learning in academic health education. A systematic literature review[J]. EurJ Dent Educ., 2010, 14(1): 55-64.
7Sore PM, Brandwein MS, Maldjian C, at al. Inflammatory pseudontmor of the maxillary sinus: CT and MR findings in six cases[J]. A JR, 1994, 163(3): 689-692.
10Polyzois I, Claffey N, Mattheos N. Problem - based learning in academic health edu- cation. Asystematic nterature review. Eur ,I Dent Educ, 2010,14( 1 ) : 55 -64.
