9DObbins KR. Price FW Jr, Whitaon WE. Trends in the indications for penetrating keratoplasty in the Midwestern United States[J].Cornea,2000,19(6) :813 - 816.
10Frucht - Pery J,Shtibel H,S010mon A ,et al. Thirty years of penetrating keratoplasty in Istrael [ J ]. Cornea, 1997,16 ( 1 ) : 16,20.