ΗΡΑΚΛΕΟΥΣ ΣΩΤΗΡΟΣ ΘΑΣΙΩΝ : Izsledvanija v čest na Ilja Prokopov ot prijatelite i učenicite mu po slučaj negovta 60 godišnina = Studia in honorem Iliae Prokopov sexagenario ab amicis et discipulis dedicata = Studies in honour of Ilya Prokopov for his 60th. birthday - from his friends and pupils - Paunov, Evgeni I.; Philipova, Svetoslava; Prokopov, Ilja Simeonov (Faber, 2012)
At head of title: Academician Yordan Ivanov, Regional Historical Museum - Kyustendil, Neophit Rilsky Southwest University of Blagoevgrad, Faculty of Law and history, Bulgarian Museum Chamber Association (BMC)