@article {Лихачев1981, title = {Передовая линия обороны Болгарского государства духа}, journal = {Palaeobulgarica / Старобългаристика}, volume = {5}, year = {1981}, pages = {21{\textendash}27}, author = {Лихачев, Дмитрий} } @book {Лихачев1979, title = {Поетика древнерусской литературы}, year = {1979}, publisher = {Наука}, organization = {Наука}, edition = {3-е изд., доп.}, address = {Москва}, author = {Лихачев, Дмитрий} }