@ARTICLE{
author={Djulgerova Renna B,Popova LI,Mihailov Valentin I,Beshkov GD,Szytula A,Gondek L,Petrovic Zoran Lj},
year={2004},
title={Depth profile analysis of surface modified SnO2 gas sensors in a hollow cathode discharge},
journal={SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY},
volume={59},
number={6},
pages={905-908},
document_type={Article},
} 

@ARTICLE{
author={Popova LI,Djulgerova Renna B,Beshkov GD,Mihailov Valentin I,Szytula A,Gondek L,Petrovic Zoran Lj},
year={2004},
title={SnO2 thin films for gas sensors modified by hexamethyldisilazane after rapid thermal annealing},
journal={SENSORS AND ACTUATORS B-CHEMICAL},
volume={100},
number={3},
pages={352-358},
document_type={Article},
}