| Gramatika na bulgarskiya knizhoven ezik:-Fonetika i morfologiya S Stoyanov Nauka i izkustvo, 1964 | 48 | 1964 |
| Systematical and phytogeographical analysis of the flora on Mt Golo Bardo N Apostolova-Stoyanova, S Stoyanov Phytologia Balcanica 15 (3), 401-430, 2009 | 20 | 2009 |
| Spectrophotopolarimeter: a simplified version for real time measurement at selected wavelengths L Nikolova, M Ivanov, T Todorov, S Stoyanov Bulg. J. Phys. 20, 46-54, 1993 | 20 | 1993 |
| Balkan vegetation database: Historical background, current status and future perspectives K Vassilev, H Pedashenko, A Alexandrova, A Tashev, A Ganeva, ... Phytocoenologia, 2016 | 19 | 2016 |
| Dip coating apparatus for deposition of TiO2 films C Dushkin, S Stoyanov, A Bojinova, S Rusev Ann. Univ. Sofia Fac. Chim., submitted, 2006 | 16 | 2006 |
| A new species of Cyanus (Asteraceae, Centaureinae) from southeastern Bulgaria S Bancheva, S Stoyanov Novon: A Journal for Botanical Nomenclature 19 (4), 421-425, 2009 | 13 | 2009 |
| Balkan Vegetation Database (BVD)–updated information and current status K Vassilev, H Pedashenko, A Alexandrova, A Tashev, A Ganeva, ... Vegetation Classification and Survey 1, 151-153, 2020 | 12 | 2020 |
| Lepidium virginicum (Brassicaceae)–a new non-native species to the Bulgarian flora S Stoyanov, V Vladimirov Compt. Rend. Acad. Bulg. Sci 68 (6), 725-728, 2015 | 12 | 2015 |
| The vascular flora of the catchment basin of the river Roussenski Lom (Bulgaria) in the beginning of the 21st century S Stoyanov Fl. Medit 15, 351-383, 2005 | 12 | 2005 |
| Contribution to the taxonomy and distribution of Bupleurum boissieri, B. aequiradiatum and B. gerardi (Apiaceae) in the Balkans. S Stoyanov | 11 | 2019 |
| Genista tetragona (Fabaceae), a neglected species in the Bulgarian flora. S Stoyanov Phytologia balcanica 20, 2014 | 11 | 2014 |
| Ambrosia trifida (Asteraceae), a new non-native species for the Bulgarian flora S Stoyanov, V Vladimirov, S Milanova Comptes rendus de l’Académie bulgare des Sciences 67 (12), 2014 | 11 | 2014 |
| Cardamine× rhodopaea (Brassicaceae), a triploid hybrid from the West Rhodope Mts: Morphology, distribution, relationships and origin M Ančev, P Yurukova-Grancharova, P Ignatova, V Goranova, S Stoyanov, ... Phytologia Balcanica 19 (3), 323-338, 2013 | 11 | 2013 |
| Photoinduced anisotropy: new photopolarimetric setup for real-time measurements L Nikolova, T Todorov, P Sharlandjiev, S Stoyanov Applied optics 31 (31), 6698-6701, 1992 | 11 | 1992 |
| Thymus jalasianus (Lamiaceae), a new species from the serpentine area of the Eastern Rhodope Mountains, Bulgaria S Stoyanov, Y Marinov Annales Botanici Fennici 57 (1-3), 163-172, 2020 | 10 | 2020 |
| Habitat requirements of Boreal Owl (Aegolius funereus) and Pygmy Owl (Glaucidium passerinum) in rear edge montane populations on the Balkan Peninsula BP Nikolov, T Zlatanov, T Groen, S Stoyanov, I Hristova-Nikolova, ... Avian Research 13, 100020, 2022 | 9 | 2022 |
| Reinstatement of Centaurea cyanomorpha (Asteraceae), an endemic species from Southeastern Bulgaria SS Stoyanov Phytotaxa 268 (1), 46–56-46–56, 2016 | 9 | 2016 |
| Alien species as a part of plant composition in the periphery of agricultural fields IY Aneva, P Zhelev, SS Stoyanov Acta Zoologica Bulgarica, Suppl 11, 173-176, 2018 | 8 | 2018 |
| A new annual Bupleurum (Apiaceae) species from northeastern Bulgaria and Romanian Dobrogea S Stoyanov Phytologia Balcanica 16 (1), 65-74, 2010 | 8 | 2010 |
| Gramatika na săvremennija bălgarski knižoven ezik D Tilkov, S Stoyanov, K Popov Tom 3: Sintaksis, 1983 | 8 | 1983 |