1. Extrait du groupe de travail “Moyenne Echelle” de la commission de pédologie et cartographie des sols;Boulainé;Bull. Assoc. Fr. Etud. Sol.,1966
2. Some aspects of the soil catena concept;Bushnell,1942
3. On the Question of Opening Departments of Soil Science and the Science of Microorganisms (Particularly Bacteriology) in the Imperial Russian Universities, St. Petersburg;Dokuchaev,1895
4. On the structure of the soil mantle;Fridland;Pochvovedenie,1965
5. Structure of the Soil Mantle;Fridland,1972