MathSciNet bibliographic data MR2341938 (2009f:47069) 47F05 (35J45 47A53) Rabier, Patrick J. On the index and spectrum of differential operators on \$\Bbb R\sp N\$$\Bbb R\sp N$. Proc. Amer. Math. Soc. 135 (2007), no. 12, 3875–3885 (electronic). Article

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