@ARTICLE{
author={Ristanovic Dejan,Protic Jelica Z},
year={2012},
title={Once Upon a Pocket: Programmable Calculators from the Late 1970s and Early 1980s and the Social Networks Around Them},
journal={IEEE ANNALS OF THE HISTORY OF COMPUTING},
volume={34},
number={3},
pages={55-66},
document_type={Article},
} 

@ARTICLE{
author={Protic Jelica Z,Ristanovic Dejan},
year={2011},
title={Building Computers in Serbia: The First Half of the Digital Century},
journal={COMPUTER SCIENCE AND INFORMATION SYSTEMS},
volume={8},
number={3},
pages={549-571},
document_type={Article},
} 

@ARTICLE{
author={Ristanovic Dejan,Protic Jelica Z},
year={2008},
title={The Book cipher algorithm - A simple-but safe-approach to security},
journal={DR DOBBS JOURNAL},
volume={33},
number={10},
pages={46-51},
document_type={Article},
}