Dobryni︠a︡ Nikitich i Alesha Popovich /
Smirnov, I︠U︡riĭ Ivanovich.
Smolitskiĭ, Viktor Gershonovich.
Moskva :  Nauka, 
1974.
Dobryni︠a︡ Nikitich.
Alesha Popovich.