Spider web survey or whole plant visual sampling? Impact assessment of Bt corn on non-target predatory insects with two concurrent methodsFerenc Tóth, Krisztina Árpás, Dóra Szekeres, Ferenc Kádár, Ferenc Szentkirályi, Ágnes Szénási and József KissEnviron. Biosafety Res., 3 4 (2004) 225-231DOI: https://doi.org/10.1051/ebr:2005006