[1]
V. S. Barbulyak and Y. G. Kondratiev, “Periodic Gibbs states”,
Ukr. Mat. Zhurn.
, vol. 45, no. 4, pp. 451–458, Apr. 1993, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/5831