Йордан Баев и Костадин Грозев упоминают об этой истории в своей главе про болгарские спецслужбы в сборнике "A Handbook of the Communist Security Apparatus in East Central Europe 1944-1989" (Warsaw 2005):
The most serious challenge to the regime of Todor Zhivkov during his long reign was the plot aimed at his overthrow, uncovered in the spring of 1965. The conspirators were а group of people, influenced bу Maoist ideology, who declared themselves against the "revisionism" of Khrushchev and the "opportunism" of Zhivkov.
Тhe leaders of the plot were two members of the СС ВСР: Ivan Todorov-Gorunya, а former partisan commander and deputy minister at the time and Tzolo Кrastev, head of department at the Мinistry of Foreign Affairs. There were also several dozen officers involved in the plot, among them the commander of the Sofia garrison gen. Tzviatko Anev, the head of the Мinister of Defence personal cabinet соl. Ivan Velchev, the deputy chief of the Мain Political Directorate of the Bulgarian People's Army gen. Мicho Ermenkov, the сhiеf of department at the General Staff gen. Lyuben Dinov. In the unfolding counter-intelligence operation "Fools" (Duraci - from the Russian) carried out between 28 March and 12 April 1965 most of those under suspicion were arrested.
It was proven that the plotters had the intention of coordinating their activities with some former party leaders purged bу Zhivkоv, e.g. the former Рrime Мinister Anton Yugov, and the former Chiеf of the General Staff and deputy Мinister of Defence gen. Ivan Buchvarov. Тhеу had planned also to use as а demonstration of force the tank brigade dislocated around Sofia, the Guard Division and the First Army headquarters in Sofia. Тhе leader of the group, Gorunya, committed suicide at the attempt of his arrest. Nine of the other participants received sentences ranging from 8 to 15 years imprisonment, while another 192 got party or administrative punishments.
Заметка из журнала "Тайм" от 30 апреля 1965 года с сообщением из Софии
http://www.time.com/time/magazine/article/0,9171,898659,00.html
Аналитический обзор аналитика радио "Свободная Европа" от 22 апреля 1965 года о событиях в Болгарии
http://files.osa.ceu.hu/holdings/300/8/3/text/6-5-120.shtml
Коротакая статья в болгарской википедии о заговоре против Живкова
линк
Стенограмма пленума ЦК Болгарской компартии от 14 апреля 1965 года, на котором обсуждался доклад о раскрытом заговоре
http://www.nbu.bg/historyproject/dokumenti_63-89/razdel1t2/f1bop34ae6.pdf
Статья "Кой беше Горуня" (вероятно, это означает "Кем был Горуня")
http://bg-history.info/modules.php?name=News&file=article&sid=447
Воспоминания одного из подсудимых по делу о заговоре Горуни
http://pirdop.com/index.php?con=temkov#3