The Willem Hendrik Keesom reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Willem Hendrik Keesom

Willem Hendrik Keesom (1876-1956) was a Dutch scientist who in 1926 invented a method to solidify helium.

He had been student of Heike Kamerlingh Onnes, who had been the first to liquefy helium (a feat for which Onnes received a Nobel Prize).

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