00691naa#a2200193#i#450# EN\\bibl\57919 20241110062448.7 2223-9987 20230327b2023####ek#y0engy0150####ca RU Influence of Upper Boundary Condition on Railway Subgrade Hydrothermal Field in Permafrost Areas Journal article Saint-Petersburg FSBEI HE "Emperor Alexander I St. Petersburg State Transport University" 2023 11 с. Journal article local Земляное полотно. 625.12 Ven'shao Sin' Kolos Aleksey Fedorovich Petryaev Andrey Vladimirovich atjournal.ru