Nickolay Kotev, Vanjo Valkov. – Events, preceding the death of tzar Boris III according to a documents unknown to the Bulgarian intelligence service (RO-GSt). – in Journal “Voennoistoricheski Sbornik” (“Military-Historical collected articles”), Sofia, 1992, № 6, p.158-165.
– (on original language) Николай Котев, Ваньо Вълков. – Събитията около смъртта на цар Борис III по неизвестен документ на българското военно разузнаване (РО-ЩВ) – ”Военноисторически сборник”, С., 1992, кн.6, с.158-165.
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