1. 1) Moldenk, The Priynciple of Iron Founding (1917)p. 121.
2. Osann, Lehrbuch der Eisen und Stahlgiesserei (1922) s. 393.
3. Schuz, St. u.E. (1922)s.1610.
4. Allison, F. Tr. J. (1925) June 4 p.481, July 9 p. 27., (1928) April 259, 277,295.
5. Allison, The Manufacture of Chilled Iron Rolls(1929). p. 25, 87.