Klaić was highly critical about the work by some scholars like Ferdo Šišić (which she dismissed as poorly analysed), or Lj. Hauptmann (regarding the thesis of Croats migration from White Croatia and the Iranian-Caucasian theory of the origin of early Croats). Her firm assumptions on the origin and early homeland of Croats based on Margetić's thesis whereby the Croats arrived to Dalmatia in the late 8th or early 9th century, although Margetić emphasized it was only an assumption, which he later reportedly rejected. The German and Austrian scholars H. Kunstmann, J. Herrmann, R. Werner and O. Kronsteiner loose considerations on Slavs were especially influential on her viewpoints.