@misc{Zylberberg_Abram_[?]_Portrait,
 author={Zylberberg, Abram [?]},
 howpublished={online},
 type={scan of a glass negative},
 title={Portrait of a boy},
 keywords={Faces of a non-existent city (photo collection), portrait of a boy, collection of glass negatives, Rynek 4, Jewish History Tours},
}