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Székelyhidi László: The stability of d'Alembert-type functional equations. In: Acta scientiarum mathematicarum, (44) 3-4. pp. 313-320. (1982)
Székelyhidi László: Almost periodic functions and functional equations. In: Acta scientiarum mathematicarum, (42) 1-2. pp. 165-169. (1980)