SKRYPNIK, W. I. Kirkwood–Salsburg equation for a quantum lattice system of oscillators with many-particle interaction potentials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 5, p. 689–700, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3051. Acesso em: 5 dec. 2025.