Website/Catalog  (2020)  Page(s) 233.  
 
Lila Tan, Pere Dot, 1961, HT, cobalt-violet, double, 30 petals, medium size, vigorous and spreading growth, Grey Pearl XSimone, vigorous, bibliography: Mcf

Book  (Apr 1993)  Page(s) 313.  
 
Lila Tan Hybrid Tea, violet-cobalt, 1961, 'Grey Pearl' x 'Simone'; Dot, P. Description.