. . "Graaf, Johannes de" . "J." . "Eindhoven University of Technology, Department of Mathematics and Computing Science, Eindhoven"@nl . . "Graaf, J. de (1942-)" . _:B1b5c63420428da7cde83927e5fa73679 . . "J. de Graaf" . "1942"^^ . "de Graaf" . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 "2023-05-21"^^ . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 "070156182" . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 . _:B1b5c63420428da7cde83927e5fa73679 .