1. A. S.Hawtin, Steel 106, Nr. 13, 66–67, 1940.
2. M. E.Manson, Better Enamel 8, Nr. 3, 18–20, 1937; Ceram. Ind. 29, 39–40, 1937.
3. G. T. Johnston, Foundry 68, 34, 90, 1940.
4. H. Cowan, Foundry Trade J. 58, 126–30, 1938.
5. J. R. Donaldson, ebenda 61, 415–17, 1939.