@ARTICLE{
author={Dudukovic Aleksandar P,Nikacevic Nikola M,Pjanovic Rada V,Kuzeljevic Zeljko V},
year={2005},
title={Exchange between the stagnant and flowing zone in gas-flowing solids-fixed bed contactors},
journal={JOURNAL OF THE SERBIAN CHEMICAL SOCIETY},
volume={70},
number={1},
pages={137-144},
document_type={Article},
} 

@ARTICLE{
author={Dudukovic Aleksandar P,Nikacevic Nikola M,Kuzeljevic Zeljko V},
year={2004},
title={Modeling and predictions of solids dynamic holdup in gas-flowing solids-fixed bed contactors},
journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH},
volume={43},
number={23},
pages={7445-7448},
document_type={Article},
}