Journal article (2015) - M Mihaylov (author), K Chakarova (author), K Hadjiivanov (author), S Andonova (author), N Drenchev (author), E Ivanova (author), Evgeny A. Pidko (author), A. Sabetghadam Esfahani (author), B. Seoane de la Cuesta (author), J. Gascon Sabate (author), F. Kapteijn (author)