Source: Osaka J. Math. Volume 49, Number 2
(2012), 357-391.
In this paper we study geometric properties of the slowness
surface of the system of crystal acoustics for cubic crystals
in the special case when the stiffness constants satisfy the
condition $a = -2b$. The paper is a natural continuation
of the paper [9] in which related properties were studied
for general constants $a$ and $b$, but assuming that we were
in the nearly isotropic case, in which case $a - b$ has to
be small. We also take this opportunity to correct a statement
made in [9]: see Remark 1.3.
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