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Author: Peňa, Simón

• Peňa, Simón: Conjugacy criteria for half-linear differential equations. (English). Archivum Mathematicum, vol. 35 (1999), issue 1, pp. 1-11
• Peňa, Simón: Discrete spectra criteria for singular difference operators. (English). Mathematica Bohemica, vol. 124 (1999), issue 1, pp. 35-44