1. Wicke, E.—Kolloid-Z,93, 127, 1940.
2. Manegold, E.—Kolloid-Z,82, 26, 1938.
3. Schwiete, H. E., Ludwig, U.—On the determination of open pores in cement stone, Tonind.-Ztg.,90, 562–574, 1966.
4. Zagar, L.—Pore size distribution in ceramic materials, Sprechsaal 100, 1967, H. 1, 3 and 4.
5. Wicke, E., Kallenbach, R.—Surface diffusion of CO 2 in activated carbon, Kolloid.-Z., 97, 1941, 135–151.