Abstract
In the course of studying and angular dependence of the ultrasonic attenuation in bismuth at high magnetic fields and low temperatures, some extra attenuation peaks were observed in a limited range of magnetic field directions. These are not assigned to any known Landau levels, and interpreted as due to the existence of a slight warping of the electron Fermi surface. It is suggested that this warping is one cause of the anomaly in the temperature dependence described in the preceding paper.
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