Frick S; Chitty JA; Kramell R; Schmidt J; Allen RS; Larkin PJ; Kutchan TM (2004). "Transformation of opium poppy (Papaver somniferum L.) with antisense berberine bridge enzyme gene (anti-bbe) via somatic embryogenesis results in an altered ratio of alkaloids in latex but not in roots". Transgenic Res.13 (6): 607–613. doi:10.1007/s11248-004-2892-6. PMID15672841. S2CID38780571.
Frick S; Chitty JA; Kramell R; Schmidt J; Allen RS; Larkin PJ; Kutchan TM (2004). "Transformation of opium poppy (Papaver somniferum L.) with antisense berberine bridge enzyme gene (anti-bbe) via somatic embryogenesis results in an altered ratio of alkaloids in latex but not in roots". Transgenic Res.13 (6): 607–613. doi:10.1007/s11248-004-2892-6. PMID15672841. S2CID38780571.
Frick S; Chitty JA; Kramell R; Schmidt J; Allen RS; Larkin PJ; Kutchan TM (2004). "Transformation of opium poppy (Papaver somniferum L.) with antisense berberine bridge enzyme gene (anti-bbe) via somatic embryogenesis results in an altered ratio of alkaloids in latex but not in roots". Transgenic Res.13 (6): 607–613. doi:10.1007/s11248-004-2892-6. PMID15672841. S2CID38780571.