According to Russian philologist Aleksey Shakhmatov, Novgorodsko-Sofiysky Svod (Russian: Новгородско-Софийский свод, Novgorod-Sofia Compilation) is a tentative name for a hypothetical common source for the Novgorod Fourth Chronicle and the Sofia First Chronicle. 
Shakhmatov initially dated it by 1448 (hence it also used to be called 1448 compilation; Russian: "свод 1448 г."), but later revised his opinion to 1430s. Some Russian philologists shared his opinion, while others attribute the common source to the 1418 compilation of Photius, Metropolitan of Moscow.
- Bobrov, p. 129
- Bobrov, p. 131
- Aleksandr Bobrov, "15th Century Novgorod Chronicles", Александр Григорьевич Бобров, "Новгородские летописи XV века", 2001, Институт русской литературы (Пушкинский дом)
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