"Dutch cyclist" . "1919Z"^^ . "2011Z"^^ . "Derksen, Jan"@en . . . . . "1919-01-23Z"^^ . "Jan Derksen (23 January 1919 \u2013 22 May 2011) was a Dutch professional cyclist. He was world professional track sprint champion in 1946 and 1957. He was the only rider to win a gold medal at Milan, Italy, in 1939 \u2013 in the world amateur sprint \u2013 before the championship was abandoned at the outbreak of the second world war."@en . "2011-05-22Z"^^ .