AU  - Jacobs,TH
AU  - Parlevliet,J E
TI  - Durability of disease resistance / 
U1  - 632.9 
PY  - 1993///
CY  - London : 
PB  - Kluwer Academic  Press , 
KW  - Agriucltural pest control
KW  - Disease resistance
ER  -