9Sharma V K, Walter G H, Breen D H. Stress and strength intersection analysis to optimize case in carburzeoled gears [ A]. ASM Technical Report System [ C ]. A. S. M Metals Park, Ohio : 1976,76-40:44-73.
10ATLAS. Hardenability of carburized steels [ M ]. USA : Climax Molybdenum company, 1975 : 114