Le Duc Anh, Doan Thi Hai Quynh, & Ngo Thi Ha Trang. (2025). STRONG-COUPLING PERTURBATION THEORY IN A SIMPLE AND EXACTLY SOLVABLE MODEL. HNUE Journal of Science: Journal of Natural Sciences, 70(1), 36-43. https://doi.org/10.18173/2354-1059.2025-0005