1. 1) R.L. Mattson, W.S. Coleman: SAE Transactions, Vol. 62 (1954) 546
2. 2) R.L. Mattson: SAE Transactions, Vol. 62 (1954) 416
3. 3) ASM Committee on Shot Peening: Metal Progress, Vol. 66 (1954) 1, 104
4. 4) J.C. Straub, D. May: The Iron Age, Vol. 163 (1949) 15, 66
5. 5) J.O. Almen: Product Engineering, Vol. 21 (1950) 11, 117