https://www.nobelprize.org/prizes/physics/1924/siegbahn/facts/
Manne Siegbahn – Facts - NobelPrize.org
The Nobel Prize in Physics 1924 was awarded to Karl Manne Georg Siegbahn
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https://www.nobelprize.org/prizes/physics/1981/siegbahn/facts/
Kai M. Siegbahn – Facts - NobelPrize.org
The Nobel Prize in Physics 1981 was divided, one half jointly to Nicolaas Bloembergen and Arthur Leonard Schawlow
facts nobelprizekaisiegbahn