1. P. Heinke, F. Langers u. H. Gg. Wagner, diese Zeitschr. 37, 681 [1965].
2. W. R. Marshall u. R. L. Pigford: The Application of Differential Equation to Chemical Engineering Problems, University of Delaware, Newark, Delaware 1947.
3. P. A. Rice: Transient Response of a Continous Packed Distillations Column to Step Changes in the Reflux Ratio, Inst. Physikal. Chemie Univ. Göttingen 1963 (unveröff.).
4. K. Cohen, J. chem. Physics 8, 585 [1940].
5. I. Dostrovski, J. Gilles u. D. R. Llewellin: Separation of Isotopes by Fractional Distillation, in: L. Farkas Memorial Volume, ed. A. Farkas u. E. P. Wigner, Jerusalem 1952.