1. E.O. Hall: Proc. Physical Soc. London, 1951, vol. 64, pp. 747-752.
2. N.J. Petch: J. Iron Steel Institute (London), 1953, vol. 174, pp. 25-28.
3. F.E. Hauser, P.R. Landon, and J.E. Dorn: Trans. Metall. Soc. AIME, 1956, vol. 206, 589-593.
4. R.W. Armstrong: The yield and flow stress dependence on polycrystal grain size, in: T.N. Baker (ed.) Yield, flow and fracture of polycrystals, Applied Science Publishers, London, 1983, pp. 1-31.
5. M.R. Barnett, Z. Keshavarz, A.G. Beer, and D. Atwell: Acta Mater., 2004, vol. 52, pp. 5093-103.