@article{ND_2013_9_3_a5,
     author = {Alexander P. Ivanov},
     title = {On the variational formulation of dynamics of systems with friction},
     journal = {Russian journal of nonlinear dynamics},
     pages = {478--498},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2013_9_3_a5/}
}