Csörgő Piroska; Fine Benjamin; Rosenberger Gerhard: On certain equations in free groups. In: Acta scientiarum mathematicarum, (68) 1-2. pp. 95-105. (2002)
Csörgő Piroska; Fine Benjamin; Rosenberger Gerhard: On certain equations in free groups. In: Acta scientiarum mathematicarum, (68) 3-4. pp. 895-905. (2002)