1. Zahariev R., N Valchkova, H Wagatsuma. Service Robots for Special Education of Children with Disabilities: Robotized Systems for Social Applications. – Proceedings of the 21st International Conference on Computer Systems and Technologies’20, 2020, pp. 300-306. https://doi.acm.org/doi/abs/10.1145/3407982.3408023 Indexed in Scopus.
  2. Zahariev R., Valchkova N.. Existing Robotics Technologies for implementation of Special Education. In: M. Dimitrova & H. Wagatsuma (Eds.) Cyber-Physical Systems for Social Applications.(in print)., IGI-Global Pensylvania, USA, eEditorial Discovery®, 2019, ISBN:13: 9781522578796, DOI::10.4018/978-1-5225-7879-6, 2019, https://www.igi-global.com/book/ cyber-physical-systems-social-applications/210606?utm_source=m&utm medium=ac&utm_ campaign=bec to_prod&utm_content=01.31.2019
  3. Zahariev R., N. Valchkova, G.Angelpv, Paunski Y,, Krastev A.. Robots for Help in Pedagogy and Rehabilitation. Pr. of the 20-th International Conference on Computer Systems and Technologies (CompSysTech’19), ACM, New York, NY, USA,, 2019, DOI:doi.org/10.1145/3345252.3345253, 1-7, https://doi.org/10.1145/3345252.3345253
  4. N. Valchkova, Zahariev R.. Optimization of Model Operator for Service Robot, Intended to Service Persons with Disability. TECIS-19” IFAC Conference on International Stability, Technology and Culture, 26-28 September, Sozopol, Bulgaria, 52, 25, ELSEVIER, IFAC- PapersOnLine, 2019, ISSN:2405-8963, 174-179. JCR-IF (Web of Science):0.99, https://www.sciencedirect.com/science/article/pii/S2405896319323778
  5. Angelov G., Y. Paunski, R. Zahariev, N. Valchkova. Designing A Web Based Software Control System For Service Robot And Sequence Programming Using Scripting Language Editor, Complex Control Systems, 1, IR-BAS, ISSN:1310-8255, 2018, 70-73, http://ir.bas.bg/ccs/2018/13_angelov.pdf
  6. Paunski Y., G. Angelov, R. Zahariev, N. Valchkova. Embedded Lithium-Ion Battery Management And Charging Solutons For Mobile Service Robots, Complex Control Systems, 1, IR-BAS, 2018, ISSN:ISSN 1310-8255, 64-69, http://ir.bas.bg/ccs/2018/14_zahariev.pdf
  7. Zahariev R., N. Valchkova, G. Angelov, Y. Paunski. Cognetive Service Mobile Robots For Help Of Disabled People, Complex Control Systems, 1, IR-BAS, 2018, ISSN:1310-8255, 74-79, http://ir.bas.bg/ccs/2018/14_zahariev.pdf
  8. Zahariev R., Valchkova N., Mobile Service Robot For Pedagogical Rehabilitation In Special Education, сп. „Научни известия“, година XXVI, брой 3/224, НТС, 2018, ISSN:1310-3946, 120-124, https://mf.tu-sofia.bg/MNTK%20ADP%20site/4%20Proceeding/2018/Materials/ Napravlenie-4/1-R.Zahariev.pdf
  9. Valchkov L., N. Valchkova., Methodology For Efficiency Improvement In Warehouses: A Case Study From The Winter Sports Equipment Industry, Proceedings in Manufacturing Systems, 13, 3, University „Politehnica“ of Bucharest, 2018, ISSN:L-2067-9238, 95-102, https://search.proquest.com/openview/ea9767dc85a8ae4f3616636aa8cfc896/1?pq- origsite=gscholar&cbl=2035956
  10. Вълчкова, Нина Фотева. Колаборативни роботи в помощ на хората в неравностойно положение. сп. „Научни известия“, брой14/200, НТС по Машиностроене, 2017, ISSN:1300-3946, 155-159, http://oldweb.tu-sofia.bg/faculties/mf/adp/nntk_files/konf-17/ Materials/Napravlenie-4/3-4-N.Valchkova-U1.pdf
  11. Захариев, Роман Захариев, Вълчкова, Нина Фотева, Рlanning trajectory of mobile service robot using the fusion of the sensors information, сп. „Научни известия“, 14/200, НТС по Машиностроене, 2017, ISSN:1300-3946, 160-164
  12. Valchkova N., Zahariev R., Cognitive Service Robot for Help of Disabled People, Научни известия, 14/200, ТУ – София, 2016, ISSN:1310 – 3946, 168-173, http://oldweb.tu-sofia.bg/ faculties/mf/adp/nntk_files/konf-16/Materials/NAPRAVLENIE-4/2-R.Zahariev-2.pdf
  13. Zahariev R., Valchkova N., Cognitive Robotics System with Embedded Controller of Quality, Научни известия, 14/200, ТУ – София, 2016, ISSN:1310 – 3946, 288-293, http://oldweb.tu- sofia.bg/faculties/mf/adp/nntk_files/konf-16/Materials/NAPRAVLENIE-7/1-R.Zahariev-1.pdf
  14. Захариев, Р., Вълчкова, Н., Переспективи за развитие на сервизен робот „Робко 11“, чрез повишаване на мобилността и манипулативността му, за помощ на хора в неравностойно положение, НТС по Машиностроене, Сп. “Научни известия”, година ХХIII, брой 9/172, Технически университет – София, 2015, ISSN:1310-3946, 215-220, http://oldweb.tu-sofia.bg/faculties/mf/adp/nntk_files/konf-15/Materials/NAPRAVLENIE- 4/4-R.Zahariev-3-ok.pdf
  15. Захариев, Р., Петров, Е., Вълчкова, Н., Венева, И.. Подход за създаване на графичен интерфейс на потребителя за сервизен робот в помощ на инвалиди, НТС по Машиностроене, Сп. “Научни известия”, година ХХIII, брой 9/172, Технически университет – София, 2015, ISSN:1310-3946, 208-214, http://oldweb.tu-sofia.bg/faculties/ mf/adp/nntk_files/konf-15/Materials/NAPRAVLENIE-4/3-R.Zahariev-2-ok.pdf