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This composer's given name was Karol Katski. When he emigrated to Paris, he went under the name Charles de Kontski and it was this name which appears on the two string quartets and string quintet published by Richault.

So IMSLP should either list him as Charles de Kontski or Karol Katski but not Karol de Konski a name he never went by or which appears on his music published in France