@ARTICLE{
author={Baralic Djordje B,Curien Pierre-Louis,Milicevic Marina,Obradovic Jovana,Petric Zoran J,Zekic Mladen K,Zivaljevic Rade T},
year={2020},
title={Proofs and surfaces},
journal={ANNALS OF PURE AND APPLIED LOGIC},
volume={171},
number={9},
pages={-},
document_type={Article},
} 

@ARTICLE{
author={Baralic Djordje B,Jokanovic Dusan,Milicevic Marina},
year={2017},
title={Variations on Steiner's Porism},
journal={MATHEMATICAL INTELLIGENCER},
volume={39},
number={1},
pages={6-11},
document_type={Article},
}