@article{10_2298_TAM0404411V,
     author = {Miroslav Veskovi\'c and Vukman \v{C}ovi\'c},
     title = {On the instability of equilibrium of a mechanical system with nonconservative forces},
     journal = {Theoretical and applied mechanics},
     pages = {411 },
     year = {2004},
     volume = {31},
     number = {3-4},
     doi = {10.2298/TAM0404411V},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/TAM0404411V/}
}