https://www.galeriemokum.com/exhibitions/116/works/artworks-1962-onno-boerwinkel-tronie-2022/
Onno Boerwinkel, Tronie, 2022 | Galerie Mokum
onnotroniegaleriemokum
https://andis.azboman.net/obituary_-_tronie_fleenor.htm
Obituary - Tronie Fleenor
obituarytronie