Priroda i oshtestvoNikola Botušarov, Georgi N. Nikolov, Veselin Tončev · First published 2019Open the Tome
AggelosTodor Popnedelev, Dimitŭr Simeonov Angelov, Vladimir Angelov, Georgi N. Nikolov · First published 2018Open the Tome
Srednovekovnii︠a︡t bŭlgarin i "drugite"Petŭr Angelov, Angel N. Nikolov, Georgi N. Nikolov · First published 2013Open the Tome
Samostoi︠a︡telni i polusamostoi︠a︡telni vladenii︠a︡ vŭv vŭzobnovenoto bŭlgarsko t︠s︡arstvo (krai︠a︡ na XII-sredata na XIII v.)Georgi N. Nikolov · First published 2011Open the Tome
T︠S︡entralizŭm i regionalizŭm v rannosrednovekovna Bŭlgarii︠a︡, krai︠a︡ na VII -- nachaloto na XI vGeorgi N. Nikolov · First published 2005Open the Tome
