Kondratiev, A.Y. and Rebenko, A.L. (1996) “Some remarks about cluster expansion for unbounded continuous spin systems in quantum statistical mechanics”, Methods of Functional Analysis and Topology, 2(2), pp. 61–69. Available at: https://zen.imath.kiev.ua/index.php/mfat/article/view/13 (Accessed: 19 December 2025).