Rigorous peer-review is the corner-stone of high-quality academic publishing. The editorial team greatly appreciates the reviewers who contributed their knowledge and expertise to the journal’s editorial process over the past 12 months. In Volume 2 of 2019, a total of 37 papers were published in the journal, with a median time to first decision of 15.5 days and a median time to publication of 35.5 days. The editors would like to express their sincere gratitude to the following reviewers for their cooperation and dedication in 2019:
| Abayomi Otebolaku | Kwok Tai Chui |
| Abdullah M. Iliyasu | Kwok Tai CHUI |
| Adelino J. C. Pereira | L. Huraj |
| Adolfo Dannier | Laura Gastaldi |
| Adul Salam | Leszek Czechowski |
| Akrivi Katifori | Lili Nemec Zlatolas |
| Aldo Muro | Luigi Fortuna |
| Aleksandra Tutueva | Madhav Patil |
| Alessandro Mengarelli | Marcin Wachowski |
| Alessandro Tonacci | Marco Antonio Sotelo Monge |
| Alexander Pyattaev | Marco Claudio De Simone |
| Álvaro Rodríguez-Sanz | Marco Picone |
| Amir Asif | Marco Sorrentino |
| Ángel Varela | Maria Malvoni |
| Anton Rassõlkin | Marko Hölbl |
| Antonino Crivello | Martin Ibl |
| Antonio Jesus Yuste-Delgado | Mateo Gašparović |
| Ariana Pitea | Matloob Khushi |
| Barbara Re | Max Bleiweiss |
| Baris Aksanli | Mehdi Foumani |
| Benjamin Ansa | Michael Koch |
| Benjamin D. McPheron | Muhammad Omer Khan |
| Borja Bordel | Mustafa E. Amiryar |
| Christopher Sioris | Myriam Ferreira-Fernandez |
| Constantin Volosencu | Nancy Rodriguez |
| Daniele Bibbo | Ndolane Sene |
| Diane Palmer | Nikolaos Katsoulas |
| Eirini Eleni Tsiropoulou | Nima Dadashzadeh |
| Elias David Niño-Ruiz | Nipun Popli |
| Erin I. Walsh | Ondrej Krejcar |
| Evangelos Bellos | Osama Sohaib |
| Feng Hu | Philippe Gourbesville |
| Feras Alasali | Pierre-Olivier Goffard |
| Francesco Fidaleo | Qing Li |
| Ganesh R Naik | Qing Wang |
| George Adam | Rafael Maestre |
| George Suciu | Rahul Sehgal |
| Gianni Bosi | Reinhard Langmann |
| Giovanni Pau | Reza Shirazinejad |
| Giovanni Schmid | Robertas Damasevicius |
| Hab. Ludovico Minati | Sankar Prasad Mondal |
| Hana Tomášková | Saptarshi Sengupta |
| Hannu Laaksonen | Sauvey Christophe |
| Hao Wang | Sérgio Correia |
| Hsiang-Hsi Huang | Sergio Maria Patella |
| Ioan Filip | Seweryn Lipiński |
| Iosif Szeidert | Shen-Tsu Wang |
| Itshak Tkach | Shreya Dey |
| Jabar H. Yousif | Shuo Zhao |
| Jan Pašek | Stamatios Amanatiadis |
| Jan Witowski | Stelios Kazadzis |
| Janusz Dudczyk | Tao Li |
| Javier Roldán Pérez | Tero Tuovinen |
| Joao Ferreira | Tianhao Wang |
| Jorge Maestre Vidal | Tianyi LI |
| Jovana Radulovic | Tom Nadarzynski |
| Juan Antonio Sicilia-Montalvo | Tomas Sochor |
| Juan Rodríguez | Tsutomu Tsuboi |
| Julia Bilbao | Victor Ramos |
| Julien Lepine | Vinodh Chellamuthu |
| Julio Ruiz-Palmero | Vladimir Eliseev |
| Juri Belikov | Wahiba Yaïci |
| Juris Smirnovs | Wenbing Zhao |
| Kaja Antlej | Xin Yang |
| Kamran Kowsari | Xuan Sun |
| Konstantinos Tsagarakis | Zahra Pooranian |
| Kostas Vergidis | Zhaohui Yang |
| Krzysztof Prażmowski |
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