@inbook {Панкевич1951, title = {Острожницькi пергамiновi листки ХІ{\textendash}ХІІ столiття}, booktitle = {Jazykov{\`\i}dn{\'y} sborn{\'\i}k}, volume = {5}, year = {1951}, pages = {248{\textendash}258}, author = {Панькевич, I.} }