1. Anonym. 1958. A Complete Course in Canning, p. 43. The Canning Trade, Baltimore, Maryland, U.S.A.
2. Sterilization in Food Technology;Ball,1957
3. Ball, C. O. and Olson, F. C. W. 1957b. Ibid, Chapter 14.
4. Ball, C. O. and Olson, F. C. W. 1957c. Ibid, p. 244-5.
5. Conduction of Heat in solids. eq. 4 on;Carslaw,1959