Monitoring the occurrence of genetically modified oilseed rape growing along a Japanese roadside: 3-year observationsToru Nishizawa, Nobuyoshi Nakajima, Mitsuko Aono, Masanori Tamaoki, Akihiro Kubo and Hikaru SajiEnviron. Biosafety Res., 8 1 (2009) 33-44DOI: https://doi.org/10.1051/ebr/2009001