Print Source:
Complete Dictionary of Scientific Biography. Vol. 23. Detroit: Charles Scribner's Sons, 2008. p341-347.
Web Sources:
http://bc.ub.leidenuniv.nl/bc/tentoonstelling/Jan_Oort/inhoud.htm
http://www.esa.int/esaSC/SEMBPC2PGQD_index_0.html
http://www.answers.com/topic/jan-oort
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