| Plante vasculare din România. Determinator ilustrat de teren I SÂRBU, N ŞTEFAN, A OPREA "Victor B Victor", Bucureşti, 2013 | 431 | 2013 |
| Lista critică a plantelor vasculare din România A Oprea Editura Universităţii" Alexandru Ioan Cuza, 2005 | 302 | 2005 |
| Les associations végétales de Roumanie. T 2. Les associations anthropogènes GH COLDEA, A OPREA, I SÂRBU, C SÎRBU, N ŞTEFAN Presa Universitară Clujeană, 2012 | 237* | 2012 |
| Chemical, Antioxidant and Antimicrobial Investigations of Pinus cembra L. Bark and Needles CL Apetrei, C Tuchilus, AC Aprotosoaie, A Oprea, KE Malterud, A Miron Molecules 16 (9), 7773-7788, 2011 | 111 | 2011 |
| Arii speciale pentru protecţia şi conservarea plantelor în România A SÂRBU, I SÂRBU, A OPREA, NEGREAN, G., V CRISTEA, G COLDEA, ... Edit. Victor B. Victor, Bucuresti, 2007 | 77 | 2007 |
| Plante adventive în flora României C SÎRBU, A OPREA Edit. "Ion Ionescu de la Brad", Iasi, 2011 | 72 | 2011 |
| Several fruit characteristics of Rosa sp. genotypes from the Northeastern region of Romania CM Rosu, C Manzu, Z Olteanu, L Oprica, A Oprea, E Ciornea, ... Notulae Botanicae Horti Agrobotanici Cluj-Napoca 39 (2), 203-208, 2011 | 68 | 2011 |
| Preliminary study on neophytes from wetlands of Romania P ANASTASIU, G NEGREAN, C BAŞNOU, C SÎRBU, A OPREA roceeding of 4th European Conference on Biological Invasions, 27-29 …, 2006 | 59 | 2006 |
| Alpine-subalpine species richness of the Romanian Carpathians and the current conservation status of rare species G Coldea, IA Stoica, M Puşcaş, T Ursu, A Oprea Biodivers. & Conservation 18 (6), 1441-1458, 2009 | 38 | 2009 |
| State and trait anxiety as a psychopathological phenomenon correlated with postpartum depression in a Romanian sample: a pilot study VR Enatescu, I Enatescu, M Craina, A Gluhovschi, I Papava, R Romosan, ... Journal of Psychosomatic Obstetrics & Gynecology 35 (2), 55-61, 2014 | 31 | 2014 |
| New contribution to the study of alien flora in Romania. S Culiţă, O Adrian, F Peter Journal of Plant Development 18, 2011 | 30 | 2011 |
| Neophyte invasion in Moldavia (eastern Romania) in different habitat types C Sîrbu, A Oprea, C Samuil, C Tănase Folia Geobotanica 47, 215-229, 2012 | 27 | 2012 |
| Les associations vegetales de Roumanie. Tome 3. Les associations forestieres et arbustives G Coldea, A Indreica, A Oprea Presa Universitară Clujeană & Accent, 198-210, 2015 | 26 | 2015 |
| Two alien species in the spreading process in Romania: Reynoutria x bohemica Chrtek & Chrtková and Grindelia squarrosa (Pursh) Dunal C Sîrbu, A Oprea “Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary …, 2007 | 25 | 2007 |
| Lista critică a plantelor vasculare din România.[Critical list of vascular plants of Romania.] A Oprea Univ." Al. Ioan Cuza", Iasi, 2005 | 24 | 2005 |
| Critical list of vascular plants in Romania A Oprea Univ. Al. I. Cuza, Iaşi 668, 2005 | 24 | 2005 |
| Contribution to the study of plant communities dominated by Ailanthus altissima (Mill.) Swingle, in the Eastern Romania (Moldavia) C Sîrbu, A Oprea " Ion Ionescu de la Brad" University of Agricultural Sciences and Veterinary …, 2010 | 22 | 2010 |
| Vascular wild flora of Danube Delta biosphere reserve M Doroftei, A Oprea, N Ştefan, I Sârbu Sci. Ann. Danube Delta Inst.(Tulcea) 17, 15-52, 2011 | 21 | 2011 |
| Distribution and pathways of introduction of invasive alien plant species in Romania C Sîrbu, IV Miu, AA Gavrilidis, S Grădinaru, MI Niculae, C Preda, A Oprea, ... Pensoft Publishers, 2022 | 20 | 2022 |
| Vascular plants of Romania I Sârbu, N Ştefan, A Oprea Pictured determinator. Editura Victor B Victor, Bucureşti (in Romanian), 2013 | 20 | 2013 |
