References
- Dunn, J. F. and Wakefield, G. L., Exposure manual (4th Ed.). Fountain Press, Watford, England (1981).
- Dunn, J. F. and Plant, G. S" Photographic Journal, Vol. 85B, 114-120(1945).
- Gibbings, J. C., Thermomechanics, Pergamon Press, Oxford (1970), Sec. 7.4.