Istoricheskie sv︠i︡azi Skandinavii i Rossii IX-XX vv.; sbornik stateĭ - Nosov, Nikolaĭ Evgenʹevich; Shaskolʹskiĭ, Igorʹ Pavlovich (Trudy (Institut istorii SSSR (Akademi︠i︡a nauk SSSR). Leningradskoe otdelenie) ;, 1970)