1. Automatic thresholding of gray-level pictures using two-dimensional entropy
2. Andreeva H. L. Kostadinova-Georgieva A. Bosakova-Ardenska "Evaluation of porosity of bread by image processing" Food science technology and technology (in Bulgarian) 2013 Scientific works of University of food technologies Volume LX ISSN 1314--7102 pp 1136--1139. Andreeva H. L. Kostadinova-Georgieva A. Bosakova-Ardenska "Evaluation of porosity of bread by image processing" Food science technology and technology (in Bulgarian) 2013 Scientific works of University of food technologies Volume LX ISSN 1314--7102 pp 1136--1139.
3. Approved Standard "BULGARIA" - №02/2011 - Bread "White" Ministry of Agriculture and Food Sofia 2011 (in Bulgarian). Approved Standard "BULGARIA" - №02/2011 - Bread "White" Ministry of Agriculture and Food Sofia 2011 (in Bulgarian).
4. Approved Standard "BULGARIA" - №04/2011 - Bread "Brown" Ministry of Agriculture and Food Sofia 2011 (in Bulgarian). Approved Standard "BULGARIA" - №04/2011 - Bread "Brown" Ministry of Agriculture and Food Sofia 2011 (in Bulgarian).