Igor Perko

Edited By Sergio Barile, Raul Espejo, Igor Perko, Marialuisa Saviano

Edited By F. Michael Perko

By P.H. Vigor

By Nina Perkowski

Edited By Helena Bartolo, Paulo Jorge Da Silva Bartolo, Nuno Manuel Fernandes Alves, Artur Jorge Mateus, Henrique Amorim Almeida, Ana Cristina Soares Lemos, Flávio Craveiro, Carina Ramos, Igor Reis, Lina Durão, Telma Ferreira, José Pinto Duarte, Filipa Roseta, Eduardo Castro e Costa, Filipe Quaresma, João Paulouro Neves

Edited By Evgeny Y. Tsymbal, Igor Žutić

Edited By Evgeny Y. Tsymbal, Igor Žutić

Edited By Dominique Arrouays, Igor Savin, Johan Leenaars, Alex B. McBratney

Edited By Jo Shaw, Igor Štiks

By Igor Štiks, Jo Shaw

Edited By Erik Goldstein, Igor Lukes

Edited By Rory Archer, Igor Duda, Paul Stubbs