Book  (2021)  Page(s) 329-330.  Includes photo(s).
 
'Sällvassen'... Known in culture in Sweden since the 1910s....Its DNA profile is nearest to 'Gloire de France' with a similarity index of 77,8%. Other close sorts are the reference 'Président de Sèze', 'Skälby Stora' and 'Marianne Billington' with similarity indices of 72,2 and 63,6%.