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Brockhaus-1837: Motten
Brockhaus-1911: Motten · Haeckel
Eisler-1912: Haeckel, Ernst
Herder-1854: Motten
Meyers-1905: Motten · Haeckel
Pagel-1901: Haeckel, Ernst Heinrich
Pierer-1857: Motten [2] · Motten [1]