@misc{Gil'ferding_Aleksandr_Feodorovič_(1831–1872)_Pis'ma_1855,
 author={Gil'ferding, Aleksandr Feodorovič (1831–1872)},
 copyright={Public Domain},
 address={Moskva},
 howpublished={online},
 year={1855},
 publisher={V" Universitetskoj Tipografìi},
 language={rus},
 type={Text},
 title={Pis'ma ob" istorìi Serbov i Bolgar. Vyp. 1},
 keywords={history of Serbia, history of Bulgaria},
}