Note that the index numbers are only technical numbers which have no persistence. After a new system generation is done, all of them are invalid. To generate a persistent link, use the name.Use the URL:
http://ww-person.com/cgi-bin/l3/LANG=germ/F=Horst-Wilhelm!@Eberhard@Wolf@Diederich@Peter/N=v.der@Groeben
Horst-Wilhelm! Eberhard Wolf Diederich Peter v.der Groeben
alternatively: /cgi-bin/llmult/LANG=germ/P=51002451