"Leonid Aleksandrovich Portenko (11 October 1896 \u2013 26 May 1972) was a Soviet ornithologist of Ukrainian origin who carried out extensive zoogeographic studies on the birds of the northern and north-eastern Palaearctic region."@en . "1972Z"^^ . "1896-10-11Z"^^ . "Portenko, Leonid Alexandrovich"@en . "1972-05-26Z"^^ . "1896Z"^^ . "Soviet ornithologist" .