@article{10_4064_am40_3_8,
     author = {Dmitry Treschev and Oleg Zubelevich},
     title = {On weak solutions to the
 {Lagrange{\textendash}d'Alembert} equation},
     journal = {Applicationes Mathematicae},
     pages = {383--392},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {2013},
     doi = {10.4064/am40-3-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am40-3-8/}
}