1. Material from Trading Standards Service, Weights and Measures Act (1972)
2. J.B. Hull, N. Peers, R. Whalley, Z. Zeng, Fluid level monitoring by ultrasound for process control during filling of retail food containers, Applications of Multivariable System Techniques, AMST 94, Bradford, 1994, pp. 329–345
3. J.B. Hull, A.M. Muumbo, R. Whalley, Controlling waste in food processing, Proc. Conf. Strategies for Control and Management of Waste, Bradford, 1995, pp. 35–48
4. The monitoring and control of a retail food container filling machine. Proc. IMechE Part E;Zheng;J. Proc. Mech. Eng.,1995
5. J.B. Hull, K.S. Henthorn, A.M. Muumbo, Controlling waste in the food processing industry, Advances in Materials and Processing Technologies, AMPT95, Dublin, 1995, pp. 31–39