ZVYAGIN, A.; CHERANOVSKII, V. Elementary excitations and thermodynamics of zig-zag spin ladders with alternating nearest neighbor exchange interactions. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 35, n. 6, p. 578–592, 2009. DOI: 10.1063/1.3151992. Disponível em: https://fnt.ilt.kharkov.ua/index.php/fnt/article/view/f35-0578e. Acesso em: 21 лис. 2024.