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Author: Hilscher, Roman

• Hilscher, Roman: Spectral properties of general self-adjoint, even order differential operators. (English). Mathematica Slovaca, vol. 50 (2000), issue 2, pp. 165-186
• Došlý, Ondřej; Hilscher, Roman: Spectral properties of fourth order differential operators. (English). Mathematica Bohemica, vol. 122 (1997), issue 2, pp. 153-168