Versuche mit direkt neben der funkenstrecke angelegten Antennen.

Thesis (doctoral)--Universitat Greifswald.

Dvizhenie na turgoviiata na Bulgariia s" chuzhditie durzhavi. Mouvement commercial de la Bulgarie avec les pays étrangers

Mode of access: Internet.

Statisticheski godishnik na T︠s︡arstvo Bŭlgarii︠a︡ /

Mode of access: Internet.

Ezhegodnik imperatorskikh teatrov /

Publication suspended 1918-19.

Li︠e︡topisʹ Peterburgskikh Imperatorskikh teatrov; sezony 1881/82-1890/91.

Issued in fascicules as supplements to Ezhegodnik imperatorskikh teatrov 1912:7, 1913:2, 1913:4, 1914:1, 1914:6.

Khronika Imperatorskikh Moskovskikh teatrov; sezony 1806-1891 gg.

Issued in fascicules as supplements to Ezhegodnik imperatorskikh teatrov 1914:2, 1914:5, 1915.