Balslev, Erik

• MATHEMATICA SCANDINAVICA Vol. 19 (1966) - Articles
  The Singular Spectrum of Elliptic Differential Operators in $L^p (R_n)$.
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• MATHEMATICA SCANDINAVICA Vol. 11 (1962) - Articles
  Perturbation of Ordinary Differential Operators.
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• MATHEMATICA SCANDINAVICA Vol. 22 (1968) - Articles
  Discreteness of the Spectrum of a Second Order Elliptic Differential Operator in $L^2 (\mathsf{R}^n)$.
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