@ARTICLE{
author={Crvenkovic Sinisa Dj,Mitrovic Melanija S,Romano Daniel Abraham},
year={2016},
title={Basic notions of (constructive) semigroups with apartness},
journal={SEMIGROUP FORUM},
volume={93},
number={3},
pages={659-674},
document_type={Article},
} 

@ARTICLE{
author={Crvenkovic Sinisa Dj,Mitrovic Melanija S,Romano Daniel Abraham},
year={2013},
title={Semigroups with apartness},
journal={MATHEMATICAL LOGIC QUARTERLY},
volume={59},
number={6},
pages={407-414},
document_type={Article},
} 

@ARTICLE{
author={Crvenkovic Sinisa Dj,Mitrovic Melanija S,Romano Daniel Abraham},
year={2010},
title={Complementary Pair of Quasi-Antiorders},
journal={REPORTS ON MATHEMATICAL LOGIC},
volume={45},
number={},
pages={135-142},
document_type={Article},
}