52 citations · 102 across the 6 of their papers we have counts for
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R. Bertolotti, G. Contreras, L. A. Núñez +2
We present a counter example to a theorem given by Amir {\em et al.} J. Math. Phys. {\bf 35}, 3005 (1994). We also comment on a misleading statements of the same reference.