TY  - JOUR
A1  - Vergin, Anika
A1  - Freier, B.
A1  - Gzik, Axel
T1  - Investigations on effects of plant strengthening products to tri-trophic system field bean (Vicia faba (L.)) - black bean aphid (Aphis fabae Scop.) - lacewing larva (Chrysoperla carnea Steph.)
Y1  - 2004
ER  -