1. Andreev, K. P.:Contribution to discussion. In: Continuous Cultivation of Microorganisms, A Symposium, Publ. House Czechosl. Acad. Sci. Prague p. 118, 1964.
2. Beran, K.:Contribution to discussion. In: Continuous Cultivation of Microorganisms, A Symposium, Publ. House Czechoslov. Acad. Sci., Prague p. 252, 1964.
3. Cooper, C. N., Fernstrom, G. A., Miller, S. A.:Performance of agitated gas-liquid contactors. Ind. Eng. Chem. 36: 504, 1944.
4. Fencl, Z.:Contribution to discussion. In: Continuous Cultivation of Microorganisms, A Symposium, Publ. House Czechoslov. Acad. Sci., Prague p. 99, 1964a.
5. Fencl, Z.:A comparative study of cell mass production in single and multistage cultivation of microorganisms. In: Continuous Cultivation of Microorganisms, A Symposium, Publ. House Czechoslov. Acad. Sci., Prague p. 109, 1964b.