Authors
Zornitsa Dimitrova
Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
Vasil Dimitrov
Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
Daniela Borissova
Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria
Ivan Garvanov
University of Library Studies and Information Technologies, Sofia, Bulgaria
Magdalena Garvanova
University of Library Studies and Information Technologies, Sofia, Bulgaria
