@article{ND_2022_18_4_a1,
     author = {A. P. Markeev},
     title = {On a {Change} of {Variables} in {Lagrange{\textquoteright}s} {Equations}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {473--480},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2022_18_4_a1/}
}