Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Fractal and Fractional maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 40 days and the median time to publication was 19 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Abdel-Haleem, Abdel-Aty | Luisa, Beghin |
| Ahmed S., Elwakil | Mahmoud, Abdel-Aty |
| Ahmed, Madian | Manuel, Fernández-Martínez |
| Ahmet, Akdemir | Manuel, Ortigueira |
| Alejandro Pérez, Riascos | Marcel, Bogdan |
| Aleksei, Chechkin | Marcelo, Lenzi |
| Alexander J., Bies | Marek, Rydel |
| Ali, Ahmadian | Maria Alessandra, Ragusa |
| Ali, Kurt | Marina, Yashina |
| Aly, Seadawy | Marko, Vrdoljak |
| Amar, Debbouche | Martin, Stynes |
| Amin, Jajarmi | Mehmet, Yavuz |
| Andrea, Cugno | Mesut, ŞEKER |
| Andrey, Zahariev | Michael, Chryssomallis |
| Andrzej, Dzieliński | Michał, Awtoniuk |
| Andrzej, Horzela | Michele, Sciacca |
| Angelica, Malaspina | Mikhail, Kalmykov |
| António M., Lopes | Ming, Li |
| Antonio, Gonzalez | Mircea, Dulău |
| Arran, Fernandez | Mirko, D'Ovidio |
| Ashraf Mohamed, Tawfik | Mokhtar, Kirane |
| Ayed, Ale'damat | Monika, Rybczak |
| Babak, Shiri | Mostafa M. A., Khater |
| Bakhtiyor Jalilovich, Kadirkulov | Muhammad, Farooq |
| Bhuvaneswari, Sambandham | Mustafa, Inc |
| Bongsoo, Jang | Nazim I, Mahmudov |
| Boris, Baeumer | Ndolane, Sene |
| Bruce, Henry | Necati, Ozdemir |
| Bruno, Lombard | Nguyen, Xuan-Mung |
| C., Park | Nickolay, Korabel |
| Camillo, Porcaro | Nikolay K, Vitanov |
| Carla, Pinto | Nimisha, Pathak |
| Chun Kit, Lai | Otman, Mrabet |
| Claire, David | Patrick D., Shipman |
| Corina, Drapaca | Péter, Ván |
| Costas, Psychalinos | Rabha W., Ibrahim |
| D. G, Prakasha | Raegan, Higgins |
| Dana, Copot | Ravi, Ravichandran |
| Danko D., Georgiev | Renat T., Sibatov |
| Dario, Magliacano | Ricardo, Almeida |
| David, Kubanek | Richard, Herrmann |
| Da-Yan, Liu | Roberto, Garrappa |
| Dimiter, Prodanov | Roman, Kubacki |
| Diogo Francisco, Rossoni | Roman, Sotner |
| Dmitrii, Tumakov | Ryszard, Sikora |
| Dusan, Zorica | Salvatore, Graziani |
| Emile Franc, Doungmo Goufo | Sameer Chakravarthy, Vedula |
| Enrica, Pirozzi | Samira, Hamani |
| Erdal, Karapınar | Sansit, Patnaik |
| Erhan, Set | Santos, Bravo-Yuste |
| Ernesto, Zambrano-Serrano | Sergiy, Koshkin |
| Ervin K., Lenzi | Shy-Der, Lin |
| Fan, Zhang | Snezhana, Hristova |
| Federico, Cluni | Soheil, Salahshour |
| Gissell, Estrada-Rodriguez | Stanislav, Lukashchuk |
| Guido, Maione | Stefano, Serra Capizzano |
| H. T., Liu | Sverre, Holm |
| Haci Mehmet, Baskonus | Tamara, Radivilova |
| Haruhiko, Ogasawara | Teodor, Atanackovic |
| Hossein, Jafari | Themistokles, Rassias |
| Igor, Podlubny | Thomas, Takacs |
| Inés, Tejado | Tomasz P., Stefański |
| Irina, Petreska | Tommaso, Alberti |
| Iulia Martina, Bulai | Trevor, Langlands |
| Ivailo, Pandiev | Trifce, Sandev |
| Jae-Hun, Jung | Tuomas, Yrttimaa |
| Jalil, Manafianheris | Valeriy, Martynyuk |
| Jan, Glaubitz | Vasiliki, Vita |
| Jaroslav, Koton | Vasily E., Tarasov |
| Javier, Gallegos | Vassili, Kolokoltsov |
| Jean-Claude, Trigeassou | Vaughn, Voller |
| Jean-Daniel, Djida | Vicenç, Méndez |
| Jeevani, Jayasinghe | Victor, Bakhtin |
| Ji-huan, He | Vsevolod, Bohaienko |
| Jiqiang, Jiang | Waleed, Abdelhamed |
| Jocelyn, Sabatier | William S., Oates |
| Joel Esteban, Restrepo Tangarife | Wojciech J., Krzysztofik |
| Jordan, Hristov | Wojciech, Sumelka |
| Jorge, Sanchez-Ortiz | Wookyong, Kwon |
| José Francisco, Gómez Aguilar | Xuefeng , Zhang |
| José, Sánchez-Dehesa | YangQuan, Chen |
| Juan Gabriel, Avina-Cervantes | Yanping, Chen |
| Juan, Nieto | Yiheng, Wei |
| Kai, Diethelm | Yiming, Chen |
| Kai, Liu | Yong, Wang |
| Khaled, Mehrez | Youssri H., Youssri |
| Kobra, Rabiei | Yulong, Li |
| Kolade M., Owolabi | Yung, Ting |
| Kottakkaran Sooppy, Nisar | Yuriy, Povstenko |
| Krystian, Czernek | Zakia, Hammouch |
| Kyongok, Kang | Zhiping, Mao |
| Lester, Ingber | Zhiyuan, Li |
| Luciano, Mescia | |
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