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Karl Heun
[ar] كارل هيون
[arz] كارل هيون
[ca] Karl Heun
[de] Karl Heun (Mathematiker)
[hy] Կարլ Հոյն
[id] Karl Heun
[nl] Karl Heun
[pt] Karl Heun
[ru] Гойн, Карл
[sk] Karl Heun