• Danijel Obrić (Belgrade, Serbia) 
Danijel Obrić
Group for Gravitation, Particles and Fields
Institute of Physics Belgrade
Belgrade, Serbia
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• Musa Cagatay Okyay (Istanbul, Turkey)
Musa Cagatay Okyay
Physics Engineering
Istanbul Tehnical University
Istanbul, Turkey
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• Eunice Omwoyo (Vitória, Brasil)
Eunice Omwoyo
Universidade Federal Do Espírito Santo
Vitória, Brasil
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• Anca Stefania Orian (, )
Anca Stefania Orian
,
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• Tomas Ortin (Madrid, Spain)
Tomas Ortin
IFT-UAM/CSIC
Madrid, Spain
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• Per Osland (Bergen, Norway)
Per Osland
University of Bergen
Bergen, Norway
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• Aleksandar Otašević (Belgrade, Serbia)
Aleksandar Otašević
Astronomical Society "Rudjer Boskovic"
Belgrade, Serbia
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