Gergely, Szilveszter, Eszter Izsó, and András Salgó. 2015. “Comparison of Different Types of Near Infrared (NIR) Instruments in Ability to Measure Alkaloids in Capsule of Poppy (P. Somniferum)”. Periodica Polytechnica Chemical Engineering 59 (4):277-82. https://doi.org/10.3311/PPch.7725.