Book  (Apr 1999)  Page(s) 391.  
 
Comtesse Beatrix de Buisseret (1910) is actually 'Béatrix, Comtesse de Buisseret' (Soupert & Notting 1899) in The Old Rose Advisor.

Book  (Jun 1992)  Page(s) 274, 344.  
 
Beatrix, Comtesse de Buisseret Hybrid Tea. Soupert & Notting, 1899. Parentage: Seedling x 'Mme Caroline Testout'. [Author cites information from different sources... Color, silvery pink with carmine pink...]
p. 344: Beatrix, Comtesse de Buisseret Hybrid Tea. Soupert & Notting 1899

Book  (1936)  Page(s) 115.  
 
de Buisseret, Comtesse Beatrix (HT) Soup. & Nott. 1900; ? X Testout; silvery carmine-pink, large strong outer petals, small pointed centre petals, very large, double, fragrance 5/10, floriferous.

Magazine  (20 May 1911)  Page(s) 243.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Beatrix Comtesse de Buisseret... H.T., Soupert, 1899, Seedling X Caroline Testout

Book  (1910)  Page(s) 326.  
 
Beatrix Comtesse de Buisseret [Hybrid Tea]; clear rose shaded rosy carmine. A seedling from 'Caroline Testout'. Growth vigorous.