1. S. E. Cornu:Nuoro Cimento,17, 580 (1960).
2. J. W. Zink:Vue of small source theory in the determination of the critical size of heterogeneous thermal reactors, NAA-SR-8222.
3. J. W. Zink andG. W. Rodeback:Nucl. Sci.,9, 16 (1961).
4. S. M. Feinberg et al.:Large-scale heterogenity of the core, Part III of the paper P/2145 URSS, P.I.G.C,13, 376 (1958).