1. D. J. NEIL and A. C. BURR: AFS Trans., 1961, 67, 272-275.
2. L. C. B. MARTINS, C. W. SANDERSON and J. TESSANDORI: Light Metals, 1998, 817–826.
3. Critical assessment of reduced pressure test. Part 1: Porosity phenomena
4. J. CAMPBELL: ‘Castings’, 2nd edn; 2003, Oxford, Butterworth-Heinemann.