"Helmut Seiffert" . . . "2000"^^ . "Seiffert" . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . "Helmut" . "1927"^^ . . "Seiffert, Helmut (1927-2000)" . . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf "2023-05-23"^^ . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf "067464653" . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf . _:B44b6dc0814ddbae8e21a79d5e1ca0caf .