""Tsenov is famous in Italy for his logical Bulgarian erudition, and in Germany, with his previous work, he has revolutionized the origin of the Bulgarians and the other Slavs in the Balkans.... The thesis on the Thracian-Bulgarian origin of the Bulgarians was supported by Tsenov with a great controversial liveliness, which is sometimes quite brave but always rests on arguments that can not be denied without an absolute competence since the author, who has devoted his entire life to this study, does not allow concessions.... He establishes in a complete picture Irvine inhabit life, the language of the Thracians and Illyrians, the ethnic influence that they exercised on the development of the conquering peoples in the Balkans. He concludes in the aboriginal character of the Bulgarians, which is comprehensively addressed and clearly and accurately exposed. All of the work has been examined with a critical chronological and convincing method. He deserves praise. Mr. Tsenov shows that he is a man who has a deep knowledge and a great skill and a man who has put all his love and his whole excitement, who is always inspired by a belief that undoubtedly gives him the right to delight."