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