@inbook{johnson_1997, title={Effects of transgenic plants on agroecosystems}, ISBN={1885995415}, booktitle={Transgenic plants : Bacillus thuringiensis in Mesoamerican agriculture}, publisher={Zamorano, Honduras : Libreri?a Zamorano}, author={Johnson, T.}, editor={A. J. Hruska and Pavo?n, M. L.Editors}, year={1997}, pages={89} }