| Microwaves and metals M Gupta, EWW Leong John Wiley & Sons, 2008 | 521 | 2008 |
| The awakening of BL Lacertae: observations by Fermi, Swift and the GASP-WEBT CM Raiteri, M Villata, F D'Ammando, VM Larionov, MA Gurwell, ... Monthly Notices of the Royal Astronomical Society 436 (2), 1530-1545, 2013 | 139 | 2013 |
| Short-term flux and colour variations in low-energy peaked blazars B Rani, AC Gupta, A Strigachev, R Bachev, PJ Wiita, E Semkov, ... Monthly Notices of the Royal Astronomical Society 404 (4), 1992-2017, 2010 | 95 | 2010 |
| Optical flux and spectral variability of blazars H Gaur, AC Gupta, A Strigachev, R Bachev, E Semkov, PJ Wiita, ... Monthly Notices of the Royal Astronomical Society 425 (4), 3002-3023, 2012 | 92 | 2012 |
| Multiwavelength intraday variability of the BL Lacertae S5 0716+ 714 AC Gupta, TP Krichbaum, PJ Wiita, B Rani, KV Sokolovsky, P Mohan, ... Monthly Notices of the Royal Astronomical Society 425 (2), 1357-1370, 2012 | 71 | 2012 |
| Quasi-simultaneous two-band optical variability of the blazars 1ES 1959+ 650 and 1ES 2344+ 514 H Gaur, AC Gupta, A Strigachev, R Bachev, E Semkov, PJ Wiita, ... Monthly Notices of the Royal Astronomical Society 420 (4), 3147-3162, 2012 | 66 | 2012 |
| The large amplitude outburst of the young star HBC 722 in NGC 7000/IC 5070, a new FU Orionis candidate EH Semkov, SP Peneva, U Munari, A Milani, P Valisa Astronomy & Astrophysics 523, L3, 2010 | 65 | 2010 |
| Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension VM Larionov, M Villata, CM Raiteri, SG Jorstad, AP Marscher, I Agudo, ... Monthly Notices of the Royal Astronomical Society 461 (3), 3047-3056, 2016 | 62 | 2016 |
| Nature of intranight optical variability of BL Lacertae H Gaur, AC Gupta, R Bachev, A Strigachev, E Semkov, M Böttcher, ... Monthly Notices of the Royal Astronomical Society 452 (4), 4263-4273, 2015 | 51 | 2015 |
| Recent photometry of symbiotic stars A Skopal, M Vaňko, T Pribulla, D Chochol, E Semkov, M Wolf, A Jones Astronomische Nachrichten: Astronomical Notes 328 (9), 909-916, 2007 | 50* | 2007 |
| Multiband optical–NIR variability of blazars on diverse time-scales A Agarwal, AC Gupta, R Bachev, A Strigachev, E Semkov, PJ Wiita, ... Monthly Notices of the Royal Astronomical Society 451 (4), 3882-3897, 2015 | 39 | 2015 |
| Optical photometric and spectral study of the new FU Orionis object V2493 Cygni (HBC 722) EH Semkov, SP Peneva, U Munari, MK Tsvetkov, R Jurdana-Šepić, ... Astronomy & astrophysics 542, A43, 2012 | 36 | 2012 |
| Photometric and spectroscopic variability of the FUor star V582 Aurigae EH Semkov, SP Peneva, U Munari, M Dennefeld, H Mito, DP Dimitrov, ... Astronomy & Astrophysics 556, A60, 2013 | 34 | 2013 |
| A long-term photometric study of the FU Orionis star V 733 Cephei SP Peneva, EH Semkov, U Munari, K Birkle Astronomy & Astrophysics 515, A24, 2010 | 34 | 2010 |
| Optical and radio variability of BL Lacertae H Gaur, AC Gupta, R Bachev, A Strigachev, E Semkov, PJ Wiita, ... Astronomy & Astrophysics 582, A103, 2015 | 32 | 2015 |
| Intranight variability of 3C 454.3 during its 2010 November outburst R Bachev, E Semkov, A Strigachev, B Mihov, AC Gupta, S Peneva, ... Astronomy & Astrophysics 528, L10, 2011 | 26 | 2011 |
| Long-Term Multicolour Photometry of the Young Stellar Objects FHO 26, FHO 27, FHO 28, FHO 29, and V1929 Cygni SI Ibryamov, EH Semkov, SP Peneva Publications of the Astronomical Society of Australia 32, e021, 2015 | 23 | 2015 |
| Optical photometry of GM Cep: evidence for UXor type of variability EH Semkov, SP Peneva Astrophysics and Space Science 338 (1), 95-101, 2012 | 23 | 2012 |
| International observational campaigns of the last two eclipses in EE Cephei: 2003 and 2008/9 C Gałan, M Mikołajewski, T Tomov, D Graczyk, G Apostolovska, I Barzova, ... Astronomy & Astrophysics 544, A53, 2012 | 19 | 2012 |
| A possible new FUor star in NGC 7000 E Semkov, S Peneva The Astronomer's Telegram 2801, 1, 2010 | 19 | 2010 |
