The publishing and editorial teams would like to thank the following, for their invaluable service as 2021 reviewers for this journal. We are very grateful for the contributions made. With their help, the journal has been able to publish such high-quality articles:

• Abbas, T.
• Abbasian Arani, Ali Akbar
• Abdel-Aziz, Elsayed
• Abdelsalam, Sara
• Abdessemed, Chawki
• Abu-Hamdeh, Nidal
• Abu-Nada, Eiyad
• Adeeb, Ehsan
• Afshari, Faraz
• Aghakhani, Saeed
• Agrawal, Priyanka
• Alamian, Rezvan
• Alilat, Nacim
• Alsabery, Ammar
• Alsaedi, Ahmad
• Aly, Abdelraheem
• Aly, Emad
• Alziary, Thierry
• Antil, Harbir
• Armaghani, Taher
• Asadollahi, Arash
• Avallone, Elson
• B.J, Gireesha
• Bachok, Norfifah
• Badruddin, Irfan
• Bai, Yu
• Bairi, Abderrahmane
• Balla, Chandra
• Basak, Tanmay
• Batina, Jean
• Bauer, Pascal
• Baytaş, Ahmet
• Bellos, Evangelos
• Ben Hamida, Mohamed Bechir
• Benard, Emmanuel
• Benim, A. C.
• Benzenine, Hamidou
• Bessaih, Rachid
• Bhatti, M. M.
• Bibi, Aneela
• Biswas, Nirmalendu
• Bondareva, Nadezhda
• Boruah, Manash 
• Bougoffa, Lazhar
• Branco Teixeira, Filipe
• Cao, Xiaxin
• Chai, Xiang 
• Chakravarthy, Balaji
• Chakshu, Neeraj Kavan
• Chamkha, A
• Chanetz, Bruno
• Chen, G.Q.
• Cheong, Huey Tyng
• Chow, Wan-Ki
• Çiftçi, Erdem
• Cimpean, Dalia 
• Cinnella, Paola
• Codina, Ramon
• Comini, Gianni
• Cornelia, Revnic
• Cortellessa, Gino
• Cotta, Renato
• Croce, Giulio
• Cruchaga, Marcela
• Dala, Laurent
• Dehghan, Mehdi
• Delery, Jean
• Di Fraia, Simona
• Dick, Erik
• Dinarvand, Saeed
• Djebali, Ridha
• Dogonchi, A.S.
• Doranehgard, Mohammad Hossein
• Duan, Zhijian
• Ellahi, R
• Estelle, Paris
• Ezzat, Magdy
• Fallah, Nima 
• Fang, T G
• Fazli, Mohammad
• Fernandez Oro, Jesús
• Fogliatto, Ezequiel
• Fu, Guangming
• Fu, Song
• Ganji, D.D
• Gazonas, George
• Gethin, D
• Ghalambaz, Mohammad
• Gibanov, Nikita
• Gillieron, Patrick
• Gilotte, Philippe
• Goharkhah, Mohammad
• González Fallas, Andrés
• Goodarzi, Marjan
• Gopalan, Harish
• Gorla, Rama S. R.
• Gürbüz, Emine Yağız
• Habashi, Wagdi
• Hann, Richard
• Hasanuzzaman, Md
• Hashim, Ishak
• Hatami, Mohammad
• Hayat, Tasawar
• He, Chun-Hui
• He, Ji-Huan
• Hoarau, Y
• Hobiny, Aatef
• Hooman, Kamel
• Hoseinzadeh, Siamak
• Hosseinzadeh, Khashayar
• Hou, Rui
• Hristov, Jordan
• Hussain, Farooq
• Hussein, Ahmed
• Imani, Gholamreza
• Ingham, D.B.
• Irfan, Muhammad
• Ishak, Anuar
• Ismail, Mohammed
• Izadi, Mohsen
• Jafaryar, M
• Jamaludin, Anuar
• Jiang, Pei-Xue
• Jiwari, Ram
• Joshi, Yogendra
• Jue, Tswen-Chyuan 
• Jusoh, Rahimah
• K Raj, Arun
• Kang, Can
• Kardgar, Amin
• Karimi, N
• Karimipour, A.
• Khalique, Chaudry
• Khan, Ambreen
• Khan, Zafar
• Khanlari, Ataollah
• Khashi'ie, Najiyah
• Khoei, Amir
• Khuri, Suheil
• Knupp, Diego
• Kojima, Tomohisa
• Kolsi, Lioua
• Koufi, Lounes
• Krajnovic , Sinisa 
• Kulak, Michał
• Kumar, Sunil
• Laouar-Meftah, Siham
• Latifizadeh, Habibolla
• Li , Tongxing
• Li, Chung-Gang
• Liu, Houlin
• Liu, Lin
• Liu, Xianfei
• Lohner, Rainald
• Lukose, Leo
• Luo, Kai
• Mabood, Fazle
• Mahdy, A.
• Maihami, R.
• Makinde, Oluwole
• Malan, Arnaud
• Maqbool, Khadija
• Marin, Liviu
• Marin, Marin 
• Martin, Elena 
• Mavrič, Boštjan
• Mcgilvray, Matthew
• Mebarek-Oudina, Fateh
• Mehryan, S.A.M.
• Mehta, Sumit
• Merkin, John
• Mingzhou, Yu
• Mioralli, Paulo
• Mohamad Naceur, Borjini
• Mohebbi, Rasul
• Morency, François
• Mousavisani, Seyedmohammad
• Myong, Rho Shin
• Nadeem, Dr. Sohail
• Nadeem, Muhammad
• Naganthran, Kohilavani
• Nardini, Sergio
• Nasrin, Dr. Rehena
• Nazar, Roslinda
• Nishad, Surabhi
• Nithiarasu, Perumal
• Niu, Jiqiang
• Nonino, Carlo
• Nowak, Andrzej
• Ocłoń, Paweł
• Oruc, Omer
• Othman, M.
• Oztop, Hakan
• Pagan, Didier
• Pandit, Sapna
• Pao, William
• Parras, Luis
• Pati, Sukumar
• Peiravi, Mohammad Mohsen
• Pericleous, Koulis
• Perumandla, Karunakar
• Ponnaiah, Saikrishnan
• Poon, Eric K W
• Pop, Ioan
• Pueyo, Alberto
• Qiu, Tao
• Rahman, M.M.
• Rajabzadeh, Behnam
• Ramachandran, Sivaraj
• Ramos, J I
• Ransing, R S
• Rashad, A.M.
• Rashidi, Mohammad
• Rashidi, Saman
• Reddy, P. Sudarsana
• Rosca, Alin
• Rosca, Natalia
• Roundy, David
• Saberinejad, Hojjat
• Sabour, Mahmud
• Saieed, Ahmed
• Salari, Mahmoud
• Salih, DJILALI
• Sarafraz, Mohammad Mohsen
• Šarler, Božidar
• Savino, Stefano
• Selimefendigil, F
• Sepehrnia, Mojtaba
• Shafiq, Anum 
• Shahsavar, Amin
• Shehzad, N. 
• Sheikholeslami, M.
• Shen, Xiang
• Sheremet, Mikhail
• Sheremet, Mikhail
• Shevchuk, Igor
• Shinan, Chang
• Siddiqui, Dr. Muhammad Arshad
• Sivanandam, Sivasankaran
• Sobota, Tomasz
• Sowmya, G.
• Sozen, Adnan
• Sunden, Bengt
• Takahashi, Toru
• Tamma, K K
• Taner, Tolga
• Tang, Xiaolin
• Tayebi, Tahar
• Temel, Orkun
• Tian, Xiaogeng
• Tiwari, Nishant
• Tiwari, Shaligram
• Tomasiello, Stefania
• Torkaman, Soraya
• Tripathi, Dharmendra
• Tuncer, Azim Doğuş
• Turkyilmazoglu, Mustafa
• Tyliszczak, Artur
• Uddin, Mohammed  Jashim
• Ullah, Naeem
• Umavathi, C
• Uosofvand, Hamed
• Vafai, K
• Valipour, Mohammad Sadegh
• Variyenli, Halil Ibrahim
• Velazquez, Angel 
• Vemula, Rajesh
• Voller, V R
• Waini, Iskandar
• Wang, Kangle
• Wang, Kangle
• Wang, Yan
• Waqas, Muhammad
• Wazwaz, Abdul-Majid
• Wrobel, Luiz
• Wróblewski, Wlodzimierz
• Xu, Fei
• Yadav, Arun
• Yang, Suo
• Yuan, Chunmiao
• Zaib, Aurang
• Zaresharif, Mahshid
• Zeeshan, A
• Zehba, Raizah
• Zhang, Guojie
• Zhang, Hui
• Zhang, Qi
• Zheng, Dongjian
• Zheng, Yao
• Zhou, Qin
• Zohoori, Sepideh