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- [2] 110th anniversary Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology, 2014, 80 (10): : 38 - 39
- [5] SCIENTIFIC CONFERENCE DEDICATED TO THE 110TH ANNIVERSARY OF THE DEATH OF LEVSKI,VASIL BULGARIAN HISTORICAL REVIEW-REVUE BULGARE D HISTOIRE, 1983, (02): : 98 - 99