Praetorium Sostra : proučvane na rimskata krajpătna stancija Sostra na pătja Eskus - Filipopolis : II - III vek = The praetorium of Sostra : a study of the Roman Roadside Station of Sosta on Oescus – Philippopolis Road (II – III Century) - Khristov, Ivan,‏ ‎ 1970-‏ (Unicart, 2015)