Dispersive Magnetic Solid-Phase Extraction of Magnetic Hypercrosslinked Polystyrene with Carbon Dioxide for the Multicomponent Extraction of Residues of 55 Veterinary Drugs from River Waters Before Their Determination by HPLC–MS/MS - Goncharov, N. O.; Tolmacheva, V. V.; Melekhin, A. O.; Biryukova, M. A.; Apyari, V. V.; Dmitrienko, S. G. (Journal of Analytical Chemistry, 2025)