[en] Current-voltage curves of long samples of monocrystalline p-InSb and n-InSb were determined at 77K. No decrease of conductivity with increasing voltage could be found. There are not indications for a deviation of the mean temperature of holes from the lattice temperature. Further the reproducibility of previously found negative differential resistance was investigated between 90K and 130K. The negative resistance phenomena were only weak and different from the previous measurements. Problems of contacting in semiconducter measurements and methods of producing less injecting contacts are discussed. (G.Q.)