"Erkki Itkonen" . "Itkonen, Erkki (1913-1992)" . . "1992"^^ . "1913"^^ . _:Bcb9536d18dd696a75799a5fb0236ad5c . . "Itkonen" . . "Erkki" . . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c "2023-05-22"^^ . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c "068317271" . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c . _:Bcb9536d18dd696a75799a5fb0236ad5c .