1. Surmach G.P. Erosion by water and the combat against it.  Gidrometeoizdat, Leningrad, 1976. 253 p. PDF
2. Neustadt  PDF
3. 4.2.2. ZIP
4. 4.2.3_1. ZIP
5. ioga ZIP
6. yaroslavki+falshivki ZIP
7. balka_Uyutniy ZIP
8. NZ_books_soil_cons1940_70_1 PDF
9. NZ_books_soil_cons1940_70_2 PDF
10. Evdokimov_2001 PDF