@article{10_5817_AM2018_4_189,
     author = {Grigorian, Gevorg Avagovich},
     title = {Oscillatory and non oscillatory criteria for the systems of two linear first order two by two dimensional matrix ordinary differential equations},
     journal = {Archivum mathematicum},
     pages = {189--203},
     publisher = {mathdoc},
     volume = {54},
     number = {4},
     year = {2018},
     doi = {10.5817/AM2018-4-189},
     mrnumber = {3887360},
     zbl = {06997350},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5817/AM2018-4-189/}
}