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2. M. Fink, in: Jahrbuch des Eisenbahnwesens, 1957, pp. 135–148.
3. K. Hempelmann, Short-pitch corrugation on railway rails — A linear model for prediction, VDI-Fortschritt-Berichte, Reihe 12, No. 231, VDI-Verlag, Düsseldorf, 1994.