Book  (2021)  Page(s) 293-294.  Includes photo(s).
 
'Karleby' .... Known in culture in Sweden since about 1920.... The variety distinguishes itself genetically from 'Aimable Amie' by a single allelel in one marker. The similarity index is 94,1%. Morphologically no character differentiating 'Karleby' and 'Aimable Amie' could be ascertained.... Other close varieties are 'Törnfall', ?Pustebacken' and its sport as well as 'Mönbo' with similarity indices of 77,8 and 70,0%.