@article{EJDE_2016__2016__a62,
     author = {Kamachkin, Alexander M. and Potapov, Dmitriy K. and Yevstafyeva, Victoria V.},
     title = {Non-existence of periodic solutions to non-autonomous second-order differential equation with discontinuous nonlinearity},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2016},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2016__2016__a62/}
}