1. Barta č. et al.:in Proc. 4th Europ. Symp. on Mater. Sci. under Microgravity, Madrid, April 1983. ESA SP-191, June 1983, p. 79.
2. Sekerka R. F., Coriell S. R.:in Proc. of 3rd European Symp. on Mater. Sci. in Space, Grenoble, April 1979. ESA SP-142, June 1979, p. 55.
3. Petrovskii G. T., Voronkov G. L.: Optical Technology in Space. Mashinostroenie, Leningrad, 1984 (in Russian).
4. Rubinstein L.: J. Inst. Math. Appl.24 (1979) 259.
5. Langer J. S.: Rev. Mod. Phys.52 (1980) 1.