Jubilee speech of the Academician Ivan Yuhnovski, Head of the Bulgarian Academy of Sciences, held on 23 May 2003, published in Information BulletinArhivat în , la Wayback Machine. of the Bulgarian Academy of Sciences, 3(62), Sofia, 27 June 2003 (in Bulgarian).
Announcement about the eleventh session of the Government of the Republic of Macedonia on 24 October 2006 from the official siteArhivat în , la Wayback Machine. of the Government of the Republic of Macedonia (in Macedonian).
Jubilee speech of the Academician Ivan Yuhnovski, Head of the Bulgarian Academy of Sciences, held on 23 May 2003, published in Information BulletinArhivat în , la Wayback Machine. of the Bulgarian Academy of Sciences, 3(62), Sofia, 27 June 2003 (in Bulgarian).
Announcement about the eleventh session of the Government of the Republic of Macedonia on 24 October 2006 from the official siteArhivat în , la Wayback Machine. of the Government of the Republic of Macedonia (in Macedonian).
Votruba, Martin. „Holiday date”. Slovak Studies Program. University of Pittsburgh. Arhivat din original la . Accesat în .
