"Werf, Douwe Catharinus Jacob van der" . . "D.C.J. van der Werf" . "1948"^^ . "van der Werf" . . "D.C.J." . "Werf, D.C.J. van der (1948-)" . _:B571cee208c55e7df99277ce5cc53bc0e . . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e "2023-05-22"^^ . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e "073763225" . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e . _:B571cee208c55e7df99277ce5cc53bc0e .