TRIPPE, C.; KLÜMPER, A. Quantum phase transitions and thermodynamics of quantum antiferromagnets with competing interactions. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 33, n. 11, p. 1213–1221, 2007. DOI: 10.1063/1.2747066. Disponível em: http://80.92.230.95/index.php/fnt/article/view/f33-1213e. Acesso em: 10 лис. 2025.