%J Acta scientiarum mathematicarum %K TermĂŠszettudomĂĄny, Matematika, MĹąvelĹdĂŠs %N 3-4 %V 27 %A Berberian Sterling Khazag %D 1966 %P 201-203 %L acta14120 %T A note on operators whose spectrum is a spectral set