Julius Petersen
[ar] يوليوس بيترسن
[arz] يوليوس بيترسن (استاذ جامعة من دنمارك)
[ca] Julius Petersen
[cs] Julius Petersen
[da] Julius Petersen (matematiker)
[de] Julius Peter Christian Petersen
[es] Julius Petersen
[et] Julius Petersen
[fi] Julius Petersen
[fr] Julius Petersen