KAPRAL, R.; SERGI, A. Quantum-Classical Wigner-Liouville Equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 6, p. 749–756, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3641. Acesso em: 6 dec. 2025.