https://collections.arolsen-archives.org/en/search/person/6703974?s=Alfred%20Neumann&t=0&p=1
https://collections.arolsen-archives.org/en/search/person/130546277?s=Alfred%20Neumann&t=2731269&p=5
http://totenbuch.buchenwald.de/names/details/person/5328/ref/recherche https://www.mappingthelives.org/bio/ced80b79-8818-482e-91da-3e45df7f51c9