“"Dr. Tsenov, who has been a lecturer at Berlin University for years, has a double merit. He again gives us a new composition on the oldest story of the Bulgarians, which, almost 50 years after the old history of Konstantin Irechek, occupies a prominent place. It brings the Bulgarians to the many difficult-to&reach Latin, Byzantine and Old Slavic sources. The origins of the Southeastern countries and church history are, in any case, set by Tsenov for us in Central Europe in a new light.“Zeitschrift für Geopolitik”, Februar 1936”