. _:Be2ba4af3b1764c5e125695cc86840cd8 . "1931"^^ . . "Schaken"@nl . "Witkowski, Stefan (1931-2007)" . "Witkowski" . . "Stefan" . "2007"^^ . "Stefan Witkowski" . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 "2023-05-20"^^ . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 "075063867" . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 . _:Be2ba4af3b1764c5e125695cc86840cd8 .