Organ of the United Center for Research and Training in History at the Bulgarian Academy of Sciences, 1973-1980; of the United Centre for History at the Bulgarian Academy of Sciences, 1981-1989, 2; of the Institute for History at the Bulgarian Academy of Sciences, 1989, 3-1994, 1; of the Institute of History at the Bulgarian Academy of Sciences, 1994, 2-<2009, 3/4>