4Telfer Mr, Jones Gm, Shepherd Jp.Trends in the aetiology of maxillofacial fractures in the UL.Br [J] . oral maxillofial Surg, 1991,29: 250-252.
5Teller MR, Jones GM, Shepherd IR. Trends in the etiology of maxillofacial fractures in the United Kingdom (1977-1987) [J] .Br J Oral Maxillofac Surg, 1991,25: 250.