Determination of Benzimidazoles in Chicken and Egg Samples by Urea-Based Covalent Organic Polymer (UCOP) Pipette Tip–Solid-Phase Extraction (PT–SPE) and High-Performance Liquid Chromatography–Tandem Mass Spectrometry (HPLC–MS). - Xiang, Jian Jun; Yuan, Li-Juan; Liao, Qie Gen; Zhang, Da Wen; Luo, Lin Guang (Analytical Letters, 2024)