Radek Čech: Masaryk University, Czechia

Xinying Chen: University of Ostrava, Czechia

Sheila Embleton: York University, Canada

Ramon Ferrer-i-Cancho: Polytechnical University of Catalonia, Spain

Lars Johnsen: National Library of Norway

Emmerich Kelih: University of Vienna, Austria

Ján Mačutek: Mathematical Institute, Slovak Academy of Sciencese Constantine the Philosopher University in Nitra, Slovakia

George Mikros: Hamad Bin Khalifa University, Qatar

Adam Pawłowski: University of Wrocław, Poland

Arjuna Tuzzi: University of Padua, Italy

Aris Xanthos: University of Lausanne, Switzerland

Yaqin Wang: University of Vienna, Austria