TY  - BOOK
AU  - "Beek, J. & Frissel, M.J."
TI  - Simulation of Nitrogen behaviour in soils
U1  - 519.1:681.14:631.461.1/.5    L3 
PY  - 0000///Wageningen
CY  - 1973
PB  - Centre fro Agric.Pub. & Documentation
ER  -