* Albert van Helden, "Willem Hendrik Keesom 1876 – 1956", In: K. van Berkel, A. van Helden and L. Palm ed., A History of Science in the Netherlands.
==See also==*Timeline of low-temperature technology==External links==* Albert van Helden, "Willem Hendrik Keesom 1876 – 1956", In: K. van Berkel, A. van Helden and L. Palm ed., A History of Science in the Netherlands.