Book  (Oct 2001)  Page(s) 125.  Includes photo(s).
 
Clematis 'Bella
Uno Kivistik (Estonia) 1982
C. 'Serebriannyj Ruczejok' (Silver Sparking Book) seedling
... large white, single flowers... six, sometimes seven, broad yet pointed tepals... Young flowers possess a creamy stripe which fades upon maturity... white filaments and dark red anthers...