1. C.E. Peck, Jr., F.T. Mavis, Iron and Steel Engineer Yearbook, Pittsburgh, 1956, pp. 177–181.
2. C.E. Peterson, Iron and Steel Engineer Yearbook, Pittsburgh, 1956, pp. 1024–1027.
3. A. Ohunuki, K. Nakajima, 4th Int. Conf. Production Engineering, Tokyo, 1980, 1041–1046.