@article{10_21136_MB_2020_0149_19,
     author = {Grigorian, Gevorg A.},
     title = {Oscillatory and non-oscillatory criteria for linear four-dimensional {Hamiltonian} systems},
     journal = {Mathematica Bohemica},
     pages = {289--304},
     publisher = {mathdoc},
     volume = {146},
     number = {3},
     year = {2021},
     doi = {10.21136/MB.2020.0149-19},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2020.0149-19/}
}