Moskalenko, V., Dohotaru, L., Digor, D. і Cebotari, I. 2012. Stationary property of the thermodynamic potential of the Hubbard model in strong coupling diagrammatic approach for superconducting state. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР. 38, 10 (Сер 2012), 1167–1174. DOI:https://doi.org/10.1063/1.4758767.