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=fran/F=Alix/N=de@Thoire@et@Villars@*@de@Montgiffond
Alix de Thoire et Villars * de Montgiffond
alternatively: /cgi-bin/llmult/LANG=germ/P=51000536