found: Studie, akvarely a kresby Grigorije Musatova, 1943:page 5 (Karel Šourek)
found: National Library of the Czech Republic in VIAF, March 30, 2016(Karel Šourek; Czech art historian and painter; date of birth: 1909-07-28; date of death: 1950-03-29)
found: Czech Wikipedia, March 30, 2016(Karel Šourek (July 28 1909 Prague - March 29 1950 Prague); painter, graphic designer, stage designer, art critic and art historian; a member of Umělecká beseda and between 1935 and 1941 the editor of Umělecká beseda's journal Život)
