Article (magazine)  (2011)  Page(s) 50.  
 
During his 36 years of breeding activity in the Nikita Botanical Garden Gartvisom was created about 100 domestic varieties of garden roses. Some varieties, he devoted ....to famous people of his time .....Grafinja Natalya Chernyshova (Comtesse Natalie Tchernischoff)....

Article (website)  (2001)  
 
The roses «Графиня Наталья Чернышева» and «Графиня Пален» (Comtesse Nathalie Tchernischoff, Comtesse Pahlen) were devoted to sisters, living on the Southern coast.