1. Soils in Bulgaria;Antipov-Karataev,1948
2. Radiocarbon analysis of soil carbonates: An evaluation from Paleosols in southeastern Australia;Bowler,1971
3. Modern Dokuchaev's approach to soil classification and its application to soil maps of the U.S.S.R. and the world;Gerasimov,1964
4. New trends in the approaches and methods of absolute soil age determination;Gerasimov;Izv. Akad. Nauk S.S.R., Ser. Geogr.,1968
5. Absolute and relative soil age;Gerasimov;Pochvovedenie,1969