Belorybkin, G. N.; Gusynin, V. A.; Izmaylov, I. L.; Vinnichek, V. A. .; Gubaidullin, A. M.; Ofman, G. Y.; Ponomarenko, E. V.; Ponomarenko, S. V.; Safronov, P. I.; Yankov, V. V. ARMAMENT OF THE POPULATION OF SOUTH-WESTERN BOLGARIA (10TH - MID-13TH CENTURIES). АЕС 2020, 5-306.