%0 Journal Article %A Grigorian, Gevorg Avagovich %T Oscillatory and non oscillatory criteria for the systems of two linear first order two by two dimensional matrix ordinary differential equations %J Archivum mathematicum %D 2018 %P 189-203 %V 54 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.5817/AM2018-4-189/ %R 10.5817/AM2018-4-189 %G en %F 10_5817_AM2018_4_189