Transgene escape in sugar beet production fields: data from six years farm scale monitoringHenri Darmency, Yves Vigouroux, Thierry Gestat De Garambé, Marc Richard-Molard and Claude MuchembledEnviron. Biosafety Res., 6 3 (2007) 197-206DOI: https://doi.org/10.1051/ebr:2007007