Smolenskaia zemlia v IX-XIII vv. ocherki istorii Smolenshchiny i Vostochnoi Belorussii
Alekseev, L. V.(Leonid Vasil'evich)
Akademii︠a︡ nauk SSSR.Institut arkheologii.
Moskva Nauka
1980
At head 0f title: Akademiia nauk SSSR. Institut arkheologii