1. The Accurate Solution of Transport Theory Problems by the Use of a New Version of Diffusion Theory;Ackroyd;UKAEA TRG Report 1568 (R),1966
2. On a Multi-group Diffusion theory Equivalence for Transport Theory;Ackroyd,1966
3. On the Use of Diffusion-Theory for Transport Calculations;Ackroyd,1967
4. Finite Element Methods for Particle Transport: applications to reactor and radiation physics;Ackroyd,1997
5. Resolution of the Transport Equation for Anisotropic Scattering Medium into a system of Diffusion Equations;Ackroyd;Ann. Nucl. Energy,1998