@article{EJDE_2008__2008__a25,
     author = {Nittka,  Robin and Sauter,  Manfred},
     title = {Sobolev gradients for differential algebraic equations},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1165.65373},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a25/}
}