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A new version of the phase method of determining the sound velocity isproposed and implemented. It utilizes the ``Nonius'' measurement technique andcan give acceptable accuracy (~1%) in samples of submillimeter size.Measurements of the sound velocity are made in single-crystal samples of theborocarbides RNi2B2C (R = Y,Lu,Ho). The elastic constants and the Debyetemperature are calculated.Comment: 5 figures, 2 table

Elastic constants of borocarbides. New approach to acoustic measurement technique