1. R. Collins, Flow of Fluids Through Porous Materials [Russian translation], Izd. Mir, 1964.
2. M. Hallaire, ?L'eau et la production végétal. Inst. nat. rech, agronom.,? 1964.
3. M. M. Abramova, ?Movement of water in soil in the presence of evaporation, ? Tr. Pochv. in-ta AN SSSR, vol. 41, 1953.
4. E. A. Dmitriev, ?Applicability of the diffusion equation to the investigation of moisture transfer in soils, ? Tr. LGMI, no. 13, 1962.
5. A. Ban, A. F. Bogomolov, V. A. Maksimov, V. N. Niko- laevskii, V. G. Ogadzhanyants, and V. M. Ryzhik, Influence of Properties of Rocks on Movement of Liquid in Them [in Russian], Gostoptekhizdat, 1962.