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:

• A R, Annappa
• A, Balaji
• A. Ghani, Jaharah 
• Ab Latif, Najibah
• Abdelbary, Ahmed
• Abdollah, Mohd Fadzli Bin
• Abdullah, Muhammad Ilman Hakimi Chua
• Abdullah, Oday
• Abuzeid, Osama
• Adiyanto, Okka
• Ahmed, Arslan
• Ajiboye, Joseph S. 
• Akincioğlu, Sıtkı
• Ali, Mohamed Kamal Ahmed
• Allmaier, Hannes
• Altas, Emre
• Amiruddin, Hilmi
• An, Chenhui
• An, Qi
• Anand, Gagan
• Asadauskas, Svajus
• Ashraf, Umair
• Assenova, Dr. Emilia 
• Ay, Gökçe
• Bai, Shuzhan
• Balachandran, Dr. Surya Rajan 
• Balos, Sebastian
• Bannihalli, Hanumagowda
• Bansal, Pikesh
• Bao, Heyun
• Basavaraja, J Sharana
• Bayer, Raymond
• Benariba, Aboubakeur
• Benhamou, Abdessoufi
• Bhandari, Sanjeev
• Bhardwaj, Vivek
• Bi, Chunxiao
• Bican, Osman
• Bittencourt, Marco
• Blanco, Claudio
• Bognar, Garbiella
• Boncel, Slawomir
• Boon Tuan, Tee 
• Boppana, Satish Babu
• Borges, Paulo
• Brunetiere, Noel
• Buciumeanu, Mihaela
• Bujurke, Nagendra
• C, Saravanan
• Cao, Jun
• Cao, Wei
• Cardoso, Rodrigo
• Carou, Diego
• Cen, Hui
• Chang-Jian, Cai-Wan
• Chang, Li
• Chao, Mianran
• Charoo, M
• Che, Changchang
• Cheepu, Murali Mohan
• Chelladurai, Samson Jerold Samuel
• Chen, Dongju
• Chen, Dongju
• Chen, Guanci
• Chen, Guangxiong
• Chen, Haizhou
• Chen, Lei
• Chen, Leilei
• Chen, Runlin
• Chen, Shoubing
• Chen, Shu-Jiang
• Chen, Suwen
• Chen, Wei
• Chen, Yu
• Chen, Z.
• Chetti, Boualem
• Chippa, Shriniwas
• Chowdhury, Mohammad Asaduzzaman
• Cicone, Traian
• Corrêa, Edmilson Otoni
• Costa, Henara
• Cruz, Carlos
• Cui, GJ
• Cui, Jianzhong
• Cui, Li
• Cui, Shiyu
• Da Silva Jr, Washington
• Da Silva, Marcio
• Dai, Qingwen
• Daniel, Gregory
• Das, Shubhajit
• Das, Subrata
• Daud, Md Razak
• De Mello, José
• Dejun, Kong
• Deleanu, Lorena
• Demet, Seyit Mehmet
• Demirci, Ibrahim
• Deng, Deng
• Deng, Wu
• Dennison, Milon Selvam
• Desavale, Ramchandra
• Ding, Tao
• Ding, Xuexing
• Do Vale, Joao Luiz
• Dong, Guangneng
• Drees, Dirk
• Drees, Dirk
• Duan, Derong
• Durak, Ertuğrul
• Dzunic, Dragan
• Eleshaky, Moahmed
• Elkhouly, Heba
• Etsion, Izhak
• Fan, Hongwei
• Fang, Congcong
• Fang, Shiqi
• Fanjing, Meng
• Feng, Sheng
• Feng, Sheng
• Feng, Yanan
• Fernandes, Gustavo
• Ferreira, Felipe
• Fillon, Michel
• Findik, Fehim
• Friedrich, K. 
• Fueentes Carazo, Elena
• Fuentes, Elena
• Gangrade, Ajay
• Gao, Leiming 
• Gao, Ping
• Gao, Wenke
• Gbadeyan, Oluwatoyin
• Ge, Xiangyu
• Georgescu, Constantin
• Georgiou, Emmanuel
• Ghadami , Farzin
• Ghalme, Sachin
• Ghosh, Mihir
• Gonçalves, Janaina
• Gospodinova, Nina
• Grigoriev, Andrei
• Grützmacher, Philipp
• Gu, Dapeng
• Gu, Fengshou
• Gu, Qianlei
• Guan, Dong
• Guanghong, Wang
• Guo, Liang
• Guo, Yong
• Guo, Yong
• Guo, Zhiwei
• Guoda, Chen
• Guoxin, Xie
• Gupta, Munish
• Gupta, Rajeev  
• Gupta, T CS
• Gürgen, Selim
• Hadfield, Mark
• Hammou, Mahmoud
• Han, Dongjiang
• Han, Yanfeng
• He, Tao
• Hesheng, Tang
• Hirani, Harish
• Hongling, Qin
• Horng, Jeng-Haur 
• Hsu, Chia-Jui
• Hu, Hongwei
• Hu, Hongyang
• Hu, K. H.
• Hu, Kunhong
• Hua, Licheng
• Huang, Xingbao
• Hussain, Omar
• Ilie, Filip
• Ismail, Rainah
• J, Vivek
• Jackson, Robert
• Jamadar, Imran
• Jamshaid, Muhammad 
• Jia, Zhengfeng
• Jiao, Bowen
• Joshi, Shashikant
• Jun, Chen
• K, Sathickbasha
• K, Somasundara
• Kalidas, Periyaswamy
• Kamaruddin, Shafie
• Kapsiz, Murat
• Karami Mohammadi, Ardeshir
• Karuppasamy, R
• Kasim, Mohd Shahir
• Kathavate, Pravin Narayan
• Katinas, Egidijus
• Kayali, Yusuf
• Kazama, Toshiharu
• Khader, Iyas
• Khairnar, Hrishikesh
• Khanna, Navneet
• Kolev, Mihail
• König, Florian
• Kou, Ziming
• Kovalev, Alexander
• Kreivaitis, Raimondas
• Ku Ahmad, Ku Zarina
• Kudenatti, Ramesh
• Kuhn, Erik
• Kumar  S, Anoop
• Kumar, Ashutosh
• Kumar, Deepak
• Kumar, Jitesh
• Kumar, Mukesh
• Kuriachen, Basil
• Lai, Tianwei
• Lara, Luciano
• Lazaro, Leticia
• Lee, Chul-Hee
• Lee, Peter
• Li, Chuan
• Li, Guobin
• Li, Guoqing
• Li, Hulin
• Li, Jinbang
• Li, Tongyang
• Li, Yang
• Li, Zhe
• Li, Zhi
• Liang, He
• Liang, Peng
• Liang, Xingang
• Liew , Kia Wai
• Lin, Tengjiao
• Liskiewicz, Tomasz
• Liu, Jian
• Liu, Jing
• Liu, Ru Tie
• Liu, Xiaojun
• Liu, Yanbin
• Liu, Yong
• Lu, Hongxing 
• Lü, Jinjun
• Lu, Xiaolong
• Lu, Yanjun
• Lv, Fangrui
• Ma, Ping
• Magalhaes, Luis
• Mahmud, Mohd Sabri
• Mandal, Dr. Animesh
• Manoharan, Sembian
• Marian, Max
• Marinković, Aleksandar
• Mat Tahir, Mohd Faizal
• May, Ulrich
• Mazouzi, Ridha
• Md. Nasir, Ramdziah 
• Medina, Simon
• Meng, Fanming
• Meng, Xianghui
• Meng, Xiangkai
• Meng, Yonggang
• Merie, Violeta
• Mia, Md Shahin
• Mia, Mozammel
• Mikhail, Temis 
• Minami, Ishiro
• Mistry, Kuldeep
• Miyatake, Masaaki
• Mo, Shuai
• Mohd Zulkifli, Nurin Wahidah
• More, Satish
• Morina, Ardian
• Moshrefzadeh, Ali 
• Mossi, Karla
• Mouda, Mouhcine
• Mu, Liwen
• Mujtaba, M.A
• Nabhani, Mohamed
• Nakanishi , Yoshitaka 
• Nan, Feng
• Narwat, Kuldeep
• Nedelcu, Ileana 
• Nehme, Gabi
• Nguyen, Vanliem
• Ni, Zifeng
• Nicodemus, E Rajasekhar
• Nie, Chongyang
• Nikolakopoulos, Pantelis
• Nistane, Vinod
• Nogales Delgado, Sergio
• Oliveira, Sylvio
• Pan, Jiabao
• Pandey, R. K.
• Pang, Minghua
• Parlar, Zeynep
• Patel, Nimeshchandra
• Pawlus, Pawel
• Peddakondigalla, Venkateswara Babu
• Peng, Shuping
• Phalle, Vikas
• Pintaude, Giuseppe
• Poll, Gerhard
• Profito, Francisco
• Pu, Wei
• Pugi, Luca
• Qian, Shanhua
• Qu, Jianjun
• Qu, Jun 
• Quaresma, João
• Radulescu, Alexandru Valentin
• Raj, Sudhan
• Ram, Nathi
• Ramos-Moore, Esteban
• Raval, Shruti
• Razali, Mohd Najib
• Ren, Tianhui
• Ripeanu, Razvan
• Rodrigues, Túlio
• Rodriguez Ripoll, Manel 
• Rota, Alberto
• Rudnytskyj, Andre
• Ruggiero, Alessandro
• Rustamov, Ibrohim
• S, Jeyaprakasam
• S, Shankar
• Şahbaz, Mehmet
• Sahu, Krishnkant
• Saleman, Abdul Rafeq Bin
• Sarıkaya, Murat
• Seabra, Jorge
• Sehgal, Rakesh
• Shah, Dhaval
• Shao, Tianmin
• Sharma, Rajesh
• Sharma, Rajesh
• Shaw, Dein
• Sheikh, Shahid
• Shelke, Santosh
• Shen, Mingxue
• Shen, Yan
• Shengpeng, ZHAN
• Shi, Guojun
• Shi, Liping
• Shuai , Cijun 
• Singh, Sunpreet
• Singh, Yashvir
• Su, Hua
• Sulaiman, Mohd Hafis
• Sun, Dan
• Sun, Yu
• Szczęch, Marcin
• Tang, Guanghai
• Tauviqirrahman, Mohammad
• Tian, Yu
• Ul Haq, Mir Irfan
• Umehara, Noritsugu
• Uppu, Srinivasa Rao
• V V L N Rao, T
• V, Anandakrishnan
• Valigi, Maria Cristina
• Varol, Temel
• Vaxevanidis, Nikolaos
• Vencl, Aleksandar
• Venner, Kees
• Verma, Suresh
• Wang, Bing
• Wang, Cheng-Chi
• Wang, Hao
• Wang, Honggang 
• Wang, Lin
• Wang, Min
• Wang, Shibo
• Wang, Wen
• Wang, Wenzhong
• Wang, Xiaojing
• Wang, Xiaolei
• Wang, Xiaolei
• Wang, You-Qiang
• Wei, Haijun
• Widder, Lukas
• Wong, Patrick
• Wu, Ouyang
• Wu, Tonghai
• Wu, Yang
• Xiang, Guo
• Xie, Guoxin
• Xie, Zhongliang
• Xingquan, Zhang
• Xiong ,  Xiang
• Xizhi, Ma
• Xu, Xu
• Yamanoğlu, Ridvan
• Yan, Ke
• Yang, Bin
• Yang, Yulin
• Yao, Lidan
• Yao, Zhifeng
• Yetim, Fatih
• Yin, Yanguo
• Yongzhen, Zhang
• Yu, Liang
• Zadorozhnaya, Elena
• Zakaria, Muhammad Zulfattah
• Zavos, Anastasios
• Zeng, Liangcai
• Zhai, Lulu
• Zhai, Wenzheng
• Zhang, Hui
• Zhang, Jianchao
• Zhang, Jianrun
• Zhang, Julie
• Zhang, Jun
• Zhang, Junjie
• Zhang, Kai
• Zhang, Lixiu
• Zhang, Yanqin
• Zhang, Zhenyu
• Zhao, Gai
• Zhao, Guolong
• Zhao, Qin
• Zhao, Wu
• Zhao, Zhiming
• Zheng, De-Xing
• Zheng, Yanhuo
• Zhou, Guangwu
• Zhou, Wenjie
• Zhu, Pengcheng
• Zidane, Ibrahim
• Zivic, Fatima