Since the professional research in Slovakia was at the beginning, a qualified criticism of the study was missing. In 1930, Alexander Húščava published a work about colonization of Liptov in the 13th-14th centuries. According to Húščava who was influenced by his teacher Chaloupecký, Liptov was covered by deep forests and settled only in the 13th century. In 1933, Vladimír Šmilauer questioned the theory of Chaloupecký, because it was not compliant with his own research of toponymes. He found out that while Polish and Russian place names in Central Slovakia are missing, the names in the whole Slovakia (Western, Central and Eastern) are phonologically unified. He also observed that the Eastern and Western Slovak dialect were largely uniform in the 13th century what was unlikely to achieve in a short period. More, the adoption of Slavic place names by Hungarians could be explained easier and more naturally, if they came to the land already settled by the Slavs.
