https://collections.arolsen-archives.org/en/search/person/71108147?s=Fritz%20Frenzel&t=2728892&p=0
https://collections.arolsen-archives.org/en/search/person/5888965?s=Fritz%20Frenzel&t=0&p=0
https://collections.arolsen-archives.org/en/search/person/130511049?s=Fritz%20Frenzel&t=2731207&p=0