@article{ND_2020_16_2_a0,
     author = {H. M. Yehia and A. M. Hussein},
     title = {New {Families} of {Integrable} {Two-Dimensional} {Systems} with {Quartic} {Second} {Integrals}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {211--242},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2020_16_2_a0/}
}