Robert Mertens
[ar] روبرت ميرتنز
[arz] روبرت ميرتينز
[de] Robert Mertens
[es] Robert Mertens
[et] Robert Mertens
[fr] Robert Friedrich Wilhelm Mertens
[it] Robert Mertens
[la] Robertus Fridericus Gulielmus Mertens
[nl] Robert Friedrich Wilhelm Mertens
[ru] Мертенс, Роберт