Note 5: Bud Fisher's comic Mutt and Jeff, 1907, with the title “Big Klaus and Little Klaus” also became very popular in Denmark, where from 1937 it was in the weekly magazine Ude og Hjemme. Drawing-wise, the Mutt and Jeff of the cartoon version failed to live up to the quality of the comic book edition. On Bud Fisher's cartoon series Mutt and Jeff, see Maurice Horn, cited work, pp. 405-406, 406. On Bud Fisher's comic book, see Anders Hjorth Jørgensen - Inge and Karsten Just: The comics' Who - What - Where, p. 21, 21 , 108, 108.