Krepostta golemijat grad pri Staro Selo, obština Mezdra. (Terenno proučvane prez 1994 g.). The fortress called "The Big Town" near Staro Selo, Mezdra municipalty (A terrain examination carried out in 1994) - Ivanov, Plamen (Izvestija na Muzeite v Severozapadna Bălgarija, 24 (1996), 1996)