1. S. Palmqvist,Jernkontorets Ann. 141 (1971) 300.
2. Idem, Arch. Eisenhuettenw 33 (1962) 629.
3. W. Dawihl andG. Altmeyer,Z. Mettalk. 55 (1962) 231.
4. H. E. Exner,Trans. Met. Soc. AIME 245 (1969) 677.
5. A. Kuske andG. Robertson, ?Photoelastic Analysis? (Wiley, London, 1974) Chapter 16.