@ARTICLE{
author={Kostic Dragutin J,Avramovic Zoran Z,Ciric Ninoslav T},
year={2013},
title={A New Approach to Theoretical Analysis of Harmonic Content of PWM Waveforms of Single- and Multiple-Frequency Modulators},
journal={IEEE TRANSACTIONS ON POWER ELECTRONICS},
volume={28},
number={10},
pages={4557-4567},
document_type={Article},
} 

@ARTICLE{
author={Ciric Ninoslav T,Kostic Dragutin J},
year={2011},
title={On the boundedness of Lagrange multipliers of the Kuhn-Tucker theorem applied to the problem of Tikhonov function minimization},
journal={MATHEMATICAL NOTES},
volume={89},
number={3-4},
pages={408-420},
document_type={Article},
}