1. Alder, B.J., Wainwright, T.E.: Phase transition in elastic discs. Phys. Rev. 127, 359?361 (1962)
2. Dobru?in, R.L.: Gibbsian random fields. Funktional. Anal, i Prilo?en 2, 31?43 (1968); 2, 44?57 (1968); 3, 27?35 (1969)
3. Dunford, N., Schwartz, J.T.: Linear operators I. General theory. New York: Interscience 1958
4. Essam, J.W.: Percolation and cluster size. In: Phase transitions and critical phenomena, Vol. II. Domb, C., Green, M.S., eds. New York: Academic Press 1972
5. Kelley, J.L.: General topology. New York: D. Van Nostrand Co. 1955