Kallio, Petri (1 January 2006). "Suomen kantakielten absoluuttista kronologiaa" [The absolute chronology of the Proto-Uralic language]. Virittäjä (in Finnish and English). 110 (1): 2. ISSN2242-8828. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
Kallio, Petri (1 January 2006). "Suomen kantakielten absoluuttista kronologiaa" [The absolute chronology of the Proto-Uralic language]. Virittäjä (in Finnish and English). 110 (1): 2. ISSN2242-8828. Archived from the original on 23 December 2023. Retrieved 23 December 2023.
Kallio, Petri (1 January 2006). "Suomen kantakielten absoluuttista kronologiaa" [The absolute chronology of the Proto-Uralic language]. Virittäjä (in Finnish and English). 110 (1): 2. ISSN2242-8828. Archived from the original on 23 December 2023. Retrieved 23 December 2023.