LUKOVSKY, I. O.; MYKHAILYUK, O. V.; TIMOKHA, A. N. On one variational criterion of stability of pseudoequilibrium forms. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 11, p. 1494–1500, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5203. Acesso em: 5 dec. 2025.