@ARTICLE{
author={Nikolayevsky Yuri,Rakic Zoran P},
year={2016},
title={The duality principle for Osserman algebraic curvature tensors},
journal={LINEAR ALGEBRA AND ITS APPLICATIONS},
volume={504},
number={},
pages={574-580},
document_type={Article},
} 

@ARTICLE{
author={Nikolayevsky Yuri,Rakic Zoran P},
year={2013},
title={A Note on Rakic Duality Principle for Osserman Manifolds},
journal={PUBLICATIONS DE L INSTITUT MATHEMATIQUE-BEOGRAD},
volume={94},
number={108},
pages={43-45},
document_type={Article},
}