Bolnisi inscriptions are second oldest extant samples of the Georgian script. The "Bolnisi cross" appears in the center of the inscriptions.
The Bolnisi cross (Georgian:ბოლნური ჯვარიbolnuri ǰvari) is a cross symbol, taken from a 5th-century ornament at the Bolnisi Sioni church, which came to be used as a national symbol of Georgia.[1]
The four small crosses used in the Georgian flag are officially described as bolnur-kacʼxuri (bolnur-katskhuri, ბოლნურ-კაცხური) even though they are only slightly pattée.[2]
Michael Tarchnišvili: Geschichte der kirchlichen georgischen Literatur (= Studi e Testi. 185, ZDB-ID 762276-4). Auf Grund des 1. Bandes der georgischen Literaturgeschichte von K. Kekelidze bearbeitet. Biblioteca Apostolica Vaticana, Città del Vaticano 1955.
Elene Mačavariani: Bolnisis sionis samšeneblo carcera. Mec'niereba, T'bilisi 1985, (In georgischer Schrift. Zusammenfassung in russischer und französischer Sprache).
Gross, Andreas (1998). Missionare und Kolonisten: die Basler und die Hermannsburger Mission in Georgien am Beispiel der Kolonie Katharinenfeld 1818-1870 (Thesis). Hamburg: LIT. ISBN3825837289. (Zugleich: Marburg, Universität, Dissertation, 1998).
Rosen, Roger (1999). Georgia: a sovereign country of the Caucasus. Geographic expeditions. Hong Kong: Odyssey Publ. ISBN978-962-217-502-0..