found: Konttinen, Riitta. Taiteilijatoveruutta, 2014:title page (Ada Thilén) page 11 (born 1852) page 41 (was in Paris in 1878) page 95 (sketch of Duomo in Florence)
found: Suomen kuvaamataiteilijat, 1943 :page 155 (Thilen, Ada Maria; born May 10, 1852 Kuopiossa; died June 14, 1933, Helsingissä; studied in Paris with Bonnat and Gérôme; was in Italy 1894-1895; figure, landscape and portrait painter)
found: Allgemeines Künstlerlexikon online, June 1, 2015(Thilén, Ada; female painter; France, Finland; born May 10, 1852, Kuopio; died June 14, 1933, Helsinki)