Zvyagin A, Cheranovskii V. Elementary excitations and thermodynamics of zig-zag spin ladders with alternating nearest neighbor exchange interactions. Fiz. Nizk. Temp. [інтернет]. 23, Квітень 2009 [цит. за 11, Листопад 2025];35(6):578-92. доступний у: http://80.92.230.95/index.php/fnt/article/view/f35-0578e