KRYVCHIKOV, A. A. Effective nonfrustrated model of the antiferromagnetic spin-1/2 ladder. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 48, n. 3, p. 225–230, 2022. DOI: 10.1063/10.0009537. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f48-0225e. Acesso em: 10 лис. 2025.